parts
CPU- Athlon XP (Palomino) 1700+ or better, Athlon XP (Thouroughbred) if you can wait another month
Chipset- Via KT266a, KT400 if you can wait a month or three. Kr7a and Ak35GTR have some nice features for OC'ing and RAID
DDR- Kingmax or Corasir PC2700
PSU- Antec, Enermax, or Sparkle... minimum of 400 watts. Don't skimp on power!