What is the price difference of the 8800GS vs 9600GT? In the USA the 8800GS is cheaper. The cards can trade blows with the 8800GS winning without fsaa and the 9600GT with fsaa. Overclocking the 8800GS can be very good. Same can be said for a 9600GT. In general most people would say 9600GT is a little better, but in reality they trade blows so it depends what mattesr to you.
I have seen 8800GS cards for around £75-£80 and the 9600GT's go for anywhere from £100-£130 .
8800GS for sure at those prices.
I have both, and to be honest in gaming performance alone they are very close. For other reasons I think the 9600GT is worth more and the better buy if priced the same. But, again, at your prices...8800GS.
The 8800GS comes in various clock speeds, so keep that in mind if you don't OC yourself. A higher clocked one is more like a 9600GT, a low clocked one is a little below.