Don't own the 5770 yet... still shopping around. Still rocking my trusty dual 8800GTXs.
Simply going off of performance per watt and dollar spent. It'll cost me more in the long run to power and cool *any* GTX400 series card, than it would an HD5xxx series card.
Looking for the over-all most effecient card, and nothing from nvidia seems to be remotely efficient. Just brute power.
Kinda' like have a V10 instead of a V6 diesel.
I'll take the diesel.