It truly depends on what you are after. Since you are going after a major Physx titles like Arkham City and Borderlands 2 I would swing towards the 680. The physx in borderlands 2 is pretty noticeable. I feel you get a better deal on the NV side with Borderlands 2 and Assassins Creed (just my opinion others may like the games AMD offers). I buy for the experience and the performance. There isn't a benchmark that will benchmark the visual experience you will have with the games you play. Also the 670 may be a decent option as well and is a little bit cheaper then the 7970.