I'm building a computer for a friend and I now have to decide between getting him an 8800GS and a 9600GT. They're both fairly fast GPUs, but I'm questioning whether or not he'll need the small amount of extra muscle the 9600GT provides, seeing as he'll be playing at 1440x900. Some benchmarks I looked at suggested they were nearly equal in power, and that an overclocked 8800GS could trade punches with an 8800GTX. The 8800GS is also about $50 cheaper after a rebate. Is there any big reason I should favor the 9600GT more?