Needed: It needs a socket A that is compatible with a 2000XP Athlon cpu and have at least three slots for DDR SDRAM PC2100 memory.
Not needed: I don't need any onboard sound or graphics as I have a Audigy 2 card and Geforce 4 4600 ti card. I am not interested in overclocking so a jumperless board which autodetected everything would be prefered. I don't need raid.
The new Asus motherborad fit your criteria perfectley. It has on board sound but you can disable it as for the price you might as well buy it. Scan (click here) are doing it fot 55.00 roughly.I think the model is A7V8X.
Mine is a ECS K7S6A I find this a very stable easy configurable board with onboard sound but you need graphics card, sound can be disabled if you want to add your own check click here for a full review go to ECS site. every body will have there own favourite board but this is mine click here
Supports 400MHz FSB Athlons Dual memory controlers 6 USB2 ports (4 supplied) 2 Firewire ports SATA single or RAID (even thought you said you dont need it SATA is going to take off so why not future proof) Soundstorm Certifed 5.1 Dolby digital sound (even though you dont need it, but in games it saps less FPS than the Audigy click here ) LAN