Planning to run things like BF3 maxxed, which GPU?

If you are everplaning to run 3 monitors then go with the EVGA gtx680 4GB FTW
Butt if your only going to do 1 or 2 monitors deffinatly go with the EVGA gtx680 2GB SC Signature 2, It cost way less and they both have the same CUDA cores and the GTX 680 SC Signature also has a higher base clock rate. than the GTX660 4GB FTW.

So go with the first one, EVGA gtx680 2GB SC Signature 2