For $125 you'd probably be looking at a gts450 or hd 5770. What's the rest of your system look like? (resolution too).
Here are my Computer Specs right now.
Mother Board - Nvidia nForce 680i SLI/ 680i LT
Graphics Card - GeForce 7900 GS
Processer Intel Core 2 Dou CPU E6750 @2.66GHz 2.67 GHz
4 Gb Ram
Resolution set at 1680 x1050
420 W power supply