The chaps over at HotHardware have posted a round-up of GeForce 9600 GT based video cards from PNY, MSI, and ASUS:

When we compare just the three GeForce 9600 GTs in this round-up, the performance summary is relatively clear. The two 9600 GTs with reference clocks (the ASUS EN9600GT SILENT and the PNY Verto 9600 GT) are just a bit slower than the overclocked MSI N9600GT OC in most of the testing that we performed. It didn't take much logic to expect these results, though. What impressed us was how well the GeForce 9600 GTs fared against the GeForce 8800 GT 512MB.

All three of these GeForce 9600 GTs are good choices for different reasons. If you want a no frills, single-slot 9600 GT that is probably one of the least expensive 512MB 9600 GTs currently available, then we'd have no problem recommending the PNY Verto 9600 GT to you. It's a good buy at about $139.