I was looking at the benchmarks for the GTX650 TI against a reference 7770 and it seems that the GTX650 TI is around 20% faster. I do not know how a 650TI will compare against one of the Sapphire OC Edition 7770's. I like the EVGA GTX650 TI 1GB SSC and either of the Sapphire OC 7770's (OC, VaporX). I'm looking at both of these cards so I can make a decision on which one to purchase.
the gtx650ti does not suck. its just that it offers a little bit less performance per dollar than 7850. there if an offer goin on right now assassins creed 3 free with gtx650ti. if you are interested in AC3 then gtx650ti will be the more appealing option. otherwise 7850 is better