Case: APEVIA X-Navigator ATXA9NW-BK/500 Black Steel ATX Mid Tower Computer Case 500W Power Supply - Retail
~100$
Motherboard: GIGABYTE GA-965P-DS3 (rev. 1.3) LGA 775 Intel P965 Express ATX Intel Motherboard - Retail
~95$
Proccesor: Intel Core 2 Duo E6420 Conroe 2.13GHz 4M shared L2 Cache LGA 775 Processor - Retail
~190$
Graphics Card: EVGA 256-P2-N636-AR GeForce 7950GT 256MB 256-bit GDDR3 PCI Express x16 HDCP Video Card - Retail
~200$
Memmory: Mushkin Mushkin 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Retail
~120$
Power Supply: Cooler MasterCOOLER MASTER eXtreme Power RP-550-PCAR ATX from factor 12V V2.01 550W Power Supply 115/230 V Nemko, TUV, cUL, CE, BSM, FCC, CCC - Retail
~70$
Optical Drive: Lite-On LITE-ON Black 16X DVD-ROM 52X CD-R 32X CD-RW 52X CD-ROM 1.5MB Cache SATA Combo Drive - OEM
~26$
NO HDD or OS.
Alternative GPU (I dread ATI but meh, seems to be better bang for your buck):
http://www.newegg.com/Product/Product.aspx?Item=N82E16814102067R
~ Open Box: SAPPHIRE 100186L Radeon X1950XT 256MB 256-bit GDDR3 PCI Express x16 VIVO HDCP Video Card - OEM
~170$(GPU Review.com has it listed as 1000 more on the 3dmark comparison.)