The other builds for different budgets: http://www.tomshardware.com/forum/332705-31-looking-gaming-computer-builds-budgets-click-here
i5-2400 ($189.99)
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115074
MSI H67A-G43 (B3) 1155 ATX Motherboard ($99.99) ($20 rebate)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130616
HIS Radeon HD 6870 ($159.99) ($20 rebate)
http://www.newegg.com/Product/Product.aspx?Item=N82E16814161389
Crucial 4GB (2x2GB) DDR3 1333 MHz RAM ($18.99)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148262
Enermax NAXN ENP450AST ($39.99) ($5.99 shipping)
http://www.newegg.com/Product/Product.aspx?Item=N82E16817194090
WD 400GB 7200RPM HDD ($64.99)
http://www.newegg.com/Product/Product.aspx?Item=N82E16822236104
Rosewill Destroyer ATX Gaming Case ($49.99)
http://www.newegg.com/Product/Product.aspx?Item=N82E16811147144
ASUS x24 DVD Burner ($18.99)
http://www.newegg.com/Product/Product.aspx?Item=N82E16827135204
Total = $642.92 + $5.99 shipping + $40 rebates
i5-2400 ($189.99)
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115074
MSI H67A-G43 (B3) 1155 ATX Motherboard ($99.99) ($20 rebate)
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130616
HIS Radeon HD 6870 ($159.99) ($20 rebate)
http://www.newegg.com/Product/Product.aspx?Item=N82E16814161389
Crucial 4GB (2x2GB) DDR3 1333 MHz RAM ($18.99)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148262
Enermax NAXN ENP450AST ($39.99) ($5.99 shipping)
http://www.newegg.com/Product/Product.aspx?Item=N82E16817194090
WD 400GB 7200RPM HDD ($64.99)
http://www.newegg.com/Product/Product.aspx?Item=N82E16822236104
Rosewill Destroyer ATX Gaming Case ($49.99)
http://www.newegg.com/Product/Product.aspx?Item=N82E16811147144
ASUS x24 DVD Burner ($18.99)
http://www.newegg.com/Product/Product.aspx?Item=N82E16827135204
Total = $642.92 + $5.99 shipping + $40 rebates