it is worth the extra money for 670. however 660ti is not worth extra money over 660.
so go with either 660 or 670
+1. Of the current cards, GTX660 and GTX670 are the best choices.
I honestly dont think its worth getting a 670 now we about to approach the gtx 700 series and for the price of the 670 you can get a 770 maybe a few bucks more but just my opinion..Crysis 3 and others is coming out and i honestly think its going to take that type of a card to run it smooth not saying the 670 would because it will but from what im seeing graphically eh ima go for the 700
+1. This is what I'm doing. I'd grab a GTX670 if I was buying now, but we're so close to GTX770 I'm gonna wait. It might only be 15% faster, but it might be 50% faster. I reckon somewhere in the middle.