Your main question is: Will I want to Overclock?
If you don`t you can even go for a i5 4670 (non-k) and try to get a R9 280x, since you also can use the cooler that comes with your CPU.
If you`ll OC, as already said, you could go with AMD.
Also, is FX 8320 & R9 280/x not an option?