Whilst looking up these 3 graphics cards, I've come across a lot of people who said that the 670 and 680 are basically the same, and others saying that the 660Ti is almost as good as the 670, so is there much difference between the 660Ti and 680.
(This is for gaming, what fps difference would you see between the 3 cards)
Yea a GTX 670 makes the most sense out of 3. Performs much faster than the 660ti and about 5%-8% slower than a GTX 680
there is a problem with using that anandtech bench gpu, you have no idea if the drivers were the same for both cards. better to use a review where that is listed. NVIDIA: 306.23 WHQL (yeah i know funny to use an AMD driver review, huh?)
assuming the OP has 1920x1080:
sorry about those but the OP did ask for FPS, eh?
generally @ 1080 the 660ti is 15% less than the 670 which is 8% less than the 680.
the cheapest 660ti is $250 the 670 is $340 and the 680 is $415; generally making the 660ti, on paper, the best buy. though this does not take into account the 'non reference' models with their price/performance in any specific game. (look at metro, the 670 is clearly the best price/performance in that game)