here's my two choices: Intel Core 2 Duo E8500 or Intel Core 2 Quad Q6600
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115036
&
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115017
coupled with an evga 8800gt 512mb and
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1000 (PC2 8000) Dual Channel Kit Desktop Memory
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115036
&
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115017
coupled with an evga 8800gt 512mb and
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1000 (PC2 8000) Dual Channel Kit Desktop Memory