Differences are the ram sizes, clock speeds, memory interface (320 bit vs 384 bit) and the stream processors (96 vs 128). Either card will give you great preformance. Depends on your buget though. The 8800GTS is a better "preformance for the price" card.
Its a bit better, as it should be... but the real world performance... pff, a 7900gtx will own any game... the 8800xxx cards are just total overkill untill some better games hit the shelves. So i say get the GTS if your lookin to save a few $$. Besides, some new DX10 cards will be out soon im sure, so prices will only drop on them.
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