Looking to get a graphics card i have been looking at the 7770, 7790, 650 and 650ti (the are all 1GB versions) which card will let me play games like BF3, Farcry 3 etc ... With decent Fps on atleast medium-high settings?
All cards are comparable. It would take a synthetic benchmark to detect any difference.
The 7790 and GTX650ti are probably a bit stronger.
Take your pick if you have a favorite graphics vendor.
Do not anguish about the decision, buy the best graphics card your budget and PSU will allow.
The graphics card is the real engine for gaming.