I got approved for vogonswiki.
Wiki page below, but can be easily accessed via the main page. I'll probably add 1999 and 2001 next.
For the motherboards, they are mostly just as an example. I put them in alphabetical order and googled some motherboard roundups from Anandtech/Tomshardware and took the winners.
http://www.vogonswiki.com/index.php/Year_2000_System_Build
Some notes about 'best of year', particularly this example. Pentium 4 launched November 2000 with the i850/socket 423 chipset. Although technically the Abit TH7 and Asus P4T are the same i850/socket 423 motherboard, they didn't launch until the year 2001. However, tracking every single motherboard launch is quite tedious, so I'm going to say that if they chipset launched (e.g. i850/socket 423), then having an OEM motherboard that matches is 'year correct'. The TH7-II (i850/socket 478), would be disallowed, obviously.
There are other components not listed:
* Memory, we know PC133 is available, but there were probably some overclocked PC150 variants. Time consuming to track down.
* Storage, I can pull up some old storage roundups, but it would be quite tedious. So I'm concentrating on the CPU/GPU/Motherboard mostly at the moment.
Let me know what you guys think