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AMD Athlon 64 X2 3800+ Dual Core Processor Socket AM2 Windsor 2.0GHZ 2X512KB 89W 90NM Retail Box
Coolermaster CM 690 Mid Tower Black ATX Case 5X5.25 5X3.5INT No PS Front USB Sound Firewire & eSATA
Western Digital SE16 320GB SATA2 7200RPM 16MB 8.9MS Hard Drive OEM 3 Year MFR Warranty 
OCZ Gold XTC PC2-6400 2GB 2X1GB DDR2-800 CL5-5-5-12 240PIN DIMM Dual Channel Memory Kit
Samsung SH-S203B Black SATA DVD+RW 20X8X16 DVD-RW 20X6X16 DL 18X/12X INT DVD Writer OEM W/ Vista SW
Biostar TForce 560 A2+ ATX AM2 AM2+ Nforce 560 1PCI-E16 2PCIE-1 3PCI SATA2 RAID GBLAN Motherboard


Parts already have:
430W PSU
6800GTO PCI-E

Total ~ 521$