So after about two-three years I think I might be getting to the point where I need to upgrade my video cards (or card, depending) presently I use the GTX 670 in SLi mode but am wondering if there is a better solution, I don't MIND SLI but I still find games that don't overly work to well in it (Far Cry 4 for example) sadly I don't have a very large budget right now, so I really can't afford the multi-thousand dollar Titans (I wish! ;_; )

Don't suppose our comp experts here have suggestions? Please do note that I use only Nvidia, since its the only graphics card that Blender 3D supports for its rendering pipeline (IE: Cuda Cores) so ATI is out of the question for me.