Asus A7V133(no sound) or the Abit KT7A
AMD T-Bird 1.2ghz "C" version 266
512megs of memory, if your gonna do a lot of CAD (most for 3D rendering)
or 256megs if CAD is secondary and you can be patient when rendering.
Geforce Ultra is more than enough right now, but if you got the little bit extra the Geforce 3 will be here soon.
Soundblaster Live Xgamer 5.1 is resonable cheap right now.
I like Maxtor drives, but I know alot of peeps use IBM's. but get ata100 7200 rpms. Raid if you like, but can be a problem sometimes.
lots of good cooling so you dont need to worry about your system.
Hehe half joking here, but Vapochill cases run like almost $700 but your stuff would be cool in one.