Here's a good site that does a System Builder guide.
These PCs are actually probably stronger than you need but they will last you a long time :)
Link to Intel Value Setup - around $750
http://anandtech.com/guides/showdoc.aspx?i=3610&p=2
Link to AMD Value Setup - around $750
http://anandtech.com/guides/showdoc.aspx?i=3610&p=4
* I agree to wait for Windows 7 or get Vista with the Free Upgrade option since Windows 7 is much better (get 64 bit version!)
Current Favorites:
Wii - Muramasa, MH3, Metroid Trilogy, RS2, Okami, RE4, COD, Dead Space, Scarface
PC - L4D, TF2, BFBC2, Killing Floor, Aquaria, Warsow, many UDK indie games
Mods - MechWarrior:Living Legends, Star Wars: Galatic Warfare, PVKII, Goldeneye Source, L4D mods
PS3 - Demon Souls, Way of the Samurai 3
Social Modding Club: ModDb | Steam
