better graphics and fps, be able to record with high quality and frames, and the case is just for looks, and better management because this one is horrid
The 760 has a hardware capture card built in. Its called shadowplay which will free up quite a bit of your cpu if you were using a software capture solution.
Totally upgrade the CPU and motherboard the GPU you have is the same one i have but i have the 4gb with ACX cooling. And if you upgrade the cpu and motherboard you will have more room for more gpu's in the future !
And if you want better fps you need to keep the build even and not to strong of a gpu that will over heat the board and cpu. So cpu and motherboard is what i would do.