I put this together for my parents in may and since you already have a good video card you would be set with a configuration like this. I'm sure it would be cheaper or you could get better parts now too, I'll take a look on newegg.

Foxconn G31AX-K LGA 775 Intel G31 ATX Intel Motherboard - Retail
SAMSUNG 22X DVD Burner Black SATA Model SH-S223F - OEM
RAIDMAX SMILODON ATX-612WBP Black 1.0mm SECC Steel ATX Mid Tower Foldout MB Computer Case With 500W Power Supply - Retail
Seagate Barracuda 7200.12 ST3500418AS 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive - OEM
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL5D-4GBPQ - Retail
Intel Core 2 Duo E7400 Wolfdale 2.8GHz LGA 775 65W Dual-Core Processor Model BX80571E7400 - Retail

$402.94