From a review:
"The GeForce 9600 GT that we tested the 9500 GT against offers much more performance as my testing showed a 62% performance gain in Call of Duty 4 and a 102% boost in Bioshock at 1280x1024. For those that don't want to break the bank and game at lower resolutions the GeForce 9500 GT is a sure to play the current game titles, but you'll have to keep an eye on the settings as to reach smooth frame rates you'll have to tone it back to medium in some games."
Then again the 9600 GT is almost $100.