Right now I am running the following:
Intel E8400 3.0 GHZ
Asus P5K/EPU MoBo
Sapphire Radeon 3870HD 512M
OCZ Platinum DDR2 1066 8G
Samsung 2253bw monitor
Arch64 w/ fluxbox matched with thunar and idesk.
What a system I tell you. I program mainly so I wanted a system to handle hardcore scientific apps. So far, handles everything I can throw at it. Also handles movies with mplayer really good.