7770 is a 128bit card with 1000mhz core speed vs the 6850 256bit 775mhz core. The 6850 ties and beats the 7770 on most games with aa/af (just look at HWC review). I'd still take a 6850 over a 7770, plus I really don't like 128 bit cards because once you load up the eye candy with aa they seem to bog down.
Ps, the 550ti is a farce, GTX560 vanilla would be the lowest nvidia card to look at.
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