GH would be a better forum for posting this. Anyhow, my reccomendations:
CPU: A64 3200+
MB: Any Abit, Asus, DFI, MSI, etc with the NF4.
RAM: 1GB of quality ram like Crucial or Corsair.
VC: 7800GT
Antec makes plenty of nice cases which include a quality PSU. The cheap samsung or whatever it is DVDRW from Newegg is good. Large sata drives can be had cheaply as well, the warranty is important here. (3 years OK, 5 years better)
That will run any game out now very reasonably, most of them at max settings. (shouldn't break the bank either)