Here is what I recommend:
Case: Antec Piano II ATX Case
PSU: Antec NeoPower 480W
Motherboard: DFI LanParty Ultra nF4
Processor: AMD Athlon 64 3200+ Venice
RAM: 1-2GB of OCZ Platinum Rev. 2 PC3200
Video Card: eVGA 7800GT PCI-E
HDD: Go w/ Western Digital or Seagate
CD/DVD Drive: Sony or Lite-On
Then any extras, like case fans, Arctic Silver, etc...