Yes, I wish you luck in grabbing one, dual processor systems are a hell of a lot of fun. I started with 500MHz processors and they were enough to run quite a lot of stuff. You always have the option to sell them later and get something faster.
Seeing as the thread went this way and I'm in a rambling mood, my thoughts on some stuff which was common around here back around the time of the P2B and the present day;
AOpen: Very little experience with these though I generally heard good things. Strangely I never saw them on sale but the only place I found them were in modified Advent branded systems, this was the PC World brand and I never shopped there - preferring a small store called Quay Tek, it was Top Deck Princes Quay (Local Shopping Center), removed with every other small business for a crappy cinema some years back - so perhaps PC World sold them. The one part I have with their name on it as a Riva TNT which has never failed but has horrible signal quality. Strange really the Advent thing, Advent were one of those companies which loved the MSI MS6340, along with Packard Bell and Time... Think Tiny used them too, so generally OEMs that are all dead now. I can't say I blame the owners of these systems for replacing that crap with AOpen stuff, I would have probably done the same if I'd known where it came from.
ABIT: Were pretty good in the Socket A days but I found them to have compatibility issues and don't see many around now which makes me think they were either unreliable or unpopular for some reason. I did like their LED display they stuck to the board though, that at least looked cool.
SolTek: Were common around here, never liked them much. Caps always failed, CPU support was crap and the AGPro slots were always awkward. Last one I used decided to make burning plastic smells after a month of use and I could never get it to work again.
Gigabyte: Designed by donkeys, built by dogs... or something like that. Wouldn't touch them for any amount of money (yes, you could offer to pay me to take them and I wouldn't. Pay me double and I may burn them for you.).
BioStar: Actually used to be OK back in the 386-to-Pentium days, though they were cheaply made they did get the job done well enough. By this point today, with PCChips fading to obscurity after being bought in 2005, they actually look and feel like PCChips stuff... Almost like they want to be their replacement.
DFI: Great boards back in those P3/Athlon days, usually heavily customization oriented and excellent on overclocking ability when coupled with the correct hardware. They still make rather good industrial products which is where I first discovered them. They were good at integration too, systems like the ITOX were exceptionally good.
Intel: Intel boards (Past the Socket 5 days anyway, early ones were awful) will work forever as a rule, but the performance is crappy. Second hand they can sometimes be found cheap and if all you want is a running machine they're OK in that respect, but many seriously lack any ability to upgrade far beyond Intel's idea of the system, one Socket 775 board I have will disable its PCI-E slot if it detects a video card is installed, forcing you to use the onboard GMA. They're my last resort usually but I will pick them up if they're on their way to a trash can as they find uses.
EVGA: Never had one that worked. Every EVGA product I have bought has been DOA - serious, no joke. They do NOT like honoring their warranty either which leads back to what I said before, because I guarantee that this would not happen with a better maker. A good maker has confidence in their product and wants you to come back when you need to upgrade later, they will send a replacement and apologize immediately. EVGA clearly don't fit that category and make a living from selling plastic paperweights - even MSI beat them.
MSI: Just looking at them, you know something is wrong. They're like a slightly less worse version of the current BioStar line-up but that isn't saying much. I think I mentioned before that MSI made one of the worst boards I ever saw. A Celeron only board which has a proprietary slot where the AGP would be... Granted you get a Rage II on-board, but that might not be what I wanted. Still, should make a good machine and I will put it together one day - Celeron 266, the legendary Intel 810 chipset, limited (rubbish) SDRAM support, µATX form factor, onboard CT5880 (One of the worst audio solutions in the world), ATI Rage II which is miles from the header so the image quality is horrible, poor stability, incorrectly labelled jumpers... The list goes on, but it will make an awesome solitaire machine indeed, could maybe be really extreme and get a game of minesweeper going if I can get it to install Windows stably.
QDI: Worth a mention. Today they are just a part of Lenovo, but in times gone by they made good stuff. They usually tried to innovate being early (if not the first) to have jumper-less CPU configuration and an awesome reliability record. The ones I have came from a foundry - so lots of nasty metal dust and sut - they still work great, the only thing that broke was a fan header due to a failed fan shorting it out for years before I got the machine. They always had enough features on them and support was good. Alongside another dead ASUS (Will post a thread soon, would love to fix it) they made the only board I have which can run the VIA C3.
XFX: Just a leech, I don't know that they make anything themselves but rarely do their products work. When they were known as Pine, they used to re-badge PCChips parts, so that tells us what they are like. As noted a few times, strangely their PT-7502 (Re-labelled M520) was great, I guess the designer got bored. Worse than XFX for warranty stuff, they said I had voided the warranty on my DOA MX4000 by opening the box, I had to fix the card myself. Still have the card, it is still faulty. Personally, I dislike buying any product which is sold with less than a three year warranty as the company clearly doesn't think much to their product.
Chaintech: Also deserves a mention. These were good, usually affordable and less overclocker friendly but the latter has never been much of an interest to me. The unusual colors weren't even that ugly (gold plated backplanes! Yellow slots, black board.) and they always worked well with a wide range of hardware. Their graphics cards were pretty good too. I miss them to be honest. They made the ONLY K7 boards I have left running, the others all died horrible deaths.
My personal leaning is towards hardware from 1988-1996 it seems. Mostly 486 stuff. I like to try things from companies you never see anymore, for example. I love Zenith stuff, Everex kicked ass too, Shuttle were good back then (I have never used their later products), Micronics made some good stuff but steer clear of any boards with Intel chipsets for the 486 platform, they suck. Then there are hidden gems that nobody has ever heard of which make it all worthwhile.
@meljor; Now THAT is how you disagree with someone. 😁 That was civil, mature and well reasoned.
I always had lenience towards Compaq's Deskpro line as you did at least have some upgrade options and they were built like tanks. They earned my respect. Most of the systems at my old workplace were PII Deskpro's and I'd love to get one some day. They never broke after I started work and fixed them all up (Close to 1000 systems!) but there were other brands I had to work on. TIme used standard parts but their love of the MSI MS6340M left them with poor reliability - once I was called to the server room (Previous worker had set one up as the server for the satellite internet connection) because the accountants could smell smoke. Damn right there was smoke, it was purple, that thing never ran again and it must have been cursed because I was on the second floor and it fell out of a window while I was working on it, barely missing somebody in the street below. I nailed wooden bars across the window frames at the back of the workbenches after that. When I went to recover the machine it was gone, so who knows where it went and its probably a good thing I had removed the drives. A colleague also knocked a Deskpro out of the window, but it survived with only a damaged hard drive (which was busted anyway, which was why we had it in the repair room) and the CPU had slipped out of its socket. It booted right back up once we pushed that back in and replaced the hard disk with my testbed one. One brand I never saw anywhere else was around that building, TriGem, they were mostly Socket 7 in LPX format. Hottest running Socket 7's I have ever seen, they had a smell to them those ones, ran good enough though.
Ugh, lots of rambling. Meh, sue me.