Hey Jaeger, when I made my decision a couple of years ago, I believe I used Tom's hardware site to compare video cards.
It showed specs, pros/cons of one vs another, up to 5 comparisons at same time iirc. I ultimately chose a different brand (MSI) because of the minute details provided. I went with a 660 TI, but as I could see not all 660 TI's were created equal.
Hope that helps and see you in FSO (hopefully this week).

And as mentioned, I needed a PSU upgrade, went with a Corsair 800w. Absolutely no complaints with my choices so far after 2yrs. Purchased from Frys.com iirc, because NewEgg has restocking fee.