The 6800 is ALOT better then the 6600GT when overclocked, even not overclocked the 6800's sheer performance will beat it in any circumstances.
If you have the money for a Good 6800 then your better of getting that...but if u dont have the money for it then get the 6600GT, its still a great card it just doesn't have the 16 pipe lines the 6800 has. 
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