the dual x is pretty much a steal. If your power supply can support it, get the 280 or the 280x. both these cards outperform the the gtx 960 in benchmarks. plus the 3gb of Vram will certainly help with those filters and high resolution texure packs for skyrim. The 2gb vram on the gtx 960 is alright, but why settle on 2gb when you can get 3gb on the 280 for less. Also more and more games will utilize 3gb of vram this year
Not to mention you also have mantle support, VSR will be coming to this card according to AMD. You also have Freesync