You can get 7600GT for a cheap price and it is much better than 7600GS
Newegg.com - EVGA 256-P2-N615-TX GeForce 7600GT 256MB 128-bit GDDR3 PCI Express x16 Video Card - Retail
Newegg.com - EVGA 256-P2-N615-TX GeForce 7600GT 256MB 128-bit GDDR3 PCI Express x16 Video Card - Retail