I'll throw in a couple I've owned in the past and one related model that I didn't
Enermax EG375P-VE: 370w, 32A +5v, 30A +3.3v, 27A +12v over 2 rails. 240 watts for 3.3v+5v rails. This supply has pretty high ratings on every rail which allows a lot of flexibility - of course you can't draw near max on all rails at once, but it will be able to run most computers because it's so flexible. Not sure exactly what I used this on offhand, possibly an Athlon XP system (I built many Athlon XP systems) though it was probably on my 2600+. Reasonably efficient, too, close to the original 80Plus standard level of efficiency. Would still power most basic machines today (no high power GPUs or server machines, of course).
FSP (Fortron / Sparkle) FSP530-60GNA: 530w, 40A +5v, 28A +3.3v, 18A +12v. No specific rating given for 3.3v+5v, but you'll be good. Low +12v current keeps this unit from being particularly good for newer systems and PCI-E video cards but I did in fact use this with Athlon XP. Was a highly regarded supply in its day especially for Barton. Probably too low +12v for anything newer.
FSP350-60PLN: 350w, 32A +5v, 28A +3.3v, 16A +12v, 3.3v+5v power rating is 220 watts. One of the first with active PFC, so it's full-range without a switch. Also has low +12v but when powering the CPU with the +5v rail, that's fine. Should be fine with Barton and older systems. Probably too low +12v for anything newer.
Edit to note: Any of what I listed should also be inspected for capacitor issues. These are good brands as is Delta but no power supply lasts forever. Any power supply older than a few years, and/or used in unknown conditions, should be inspected.
Edit 2: Preferably with an ESR meter - I think you can buy cheap ones on Ebay for under $50. Highly recommended if you'd use it on multiple items. Much, much more useful to diagnose potential bad caps than a capacitance meter or an ohmmeter or especially visual check. But if you don't have any equipment and refuse to buy any, at least do a visual check.
Yes, I always ramble this much.