Just something I designed a while ago because I was bored.
Motherboard Gigabyte GA-965P-DS3 - $153.
http://www.newegg.com/Product/Produc...82E16813128012
Case TT Tsunami - $115.
http://www.newegg.com/Product/Produc...82E16811133132
Processor Intel C2D E6300 - $193.
http://www.newegg.com/Product/Produc...82E16819115005
Memory 2 x 1GB OCZ Gold - $200.
http://www.newegg.com/Product/Produc...82E16820227124
Videocard eVGA GeForce 7900GT KO Superclocked - $290.
http://www.newegg.com/Product/Produc...82E16814130016
Hard Drive 250GB Seagate Barracuda - $80.
http://www.newegg.com/Product/Produc...82E16822148142
Power Supply 450W Forton PSU - $52.
http://www.newegg.com/Product/Produc...82E16817104954
Sound Card CSB Live! - $26.
http://www.newegg.com/Product/Produc...82E16829102176
Optical Drive Samsung DVD burner - $33.
http://www.newegg.com/Product/Produc...82E16827151133
Cooling Zalman 9500 - $63.
http://www.newegg.com/Product/Produc...82E16835118003
Total = $1205.
Switch to a better motherboard, maybe one of the ASUS marvels. And maybe the E6400 processor for a little added boost.