CPU: Intel Core 2 Duo E6600 or E6750
Graphics card 8800GTS 320mb
(might be wise to choose an SLI motherboard in case you decide to add a second graphics card later)
Decent, branded 550W psu
2 gb RAM
widescreen TFT monitor with decent response time
AGP is obsolete as far as a new build is concerned; PCI-express is todays graphics technology. I personally wouldn't worry about crossfire or SLI unless you have money to burn.