Either would make sense. Even 670 SLI would be good for high end performance at a better price than the 690.
With a 680, you'll get good performance, but with a 144hz monitor, I imagine you want to get 100+ FPS, in which case, the 690 would get you close to that without lowering a lot of settings. 670 SLI would be a more economical choice than the 690.
Do you intend to play in 3D Vision?
No 3D not to much of a fan of that. Also I will be playing games like league of legends, battle field 3 and 4 when it comes out and crysis 3 and crossfire program ill be running is auto cad, Photoshop, 3d max, revit and cinema 4d