7600 GT yaar, dont be fooled by the 512 MB thing, ive heard ppl saying go for a 6200 512 MB instead of a better card. The 6800 GS is not powerful enough to actually make use of the 512 MB. The 7600 GT 256 MB is a great midrange card and beats the 6800 GS convincingly.
Edit: DD these cards, 7600 and 7900 from BIG are supposed to be good, coz theyre all manufactured by nvidia oem's.
Edit2: Oh yeah also mohit has a deal for leadtek 7600 GT for 14k, go for it.