It's a bit hard to choose. There's one with a GTX770, which would be the strongest build graphically, but it has a FX4300 CPU. The CPU could bottleneck that GPU a bit.
i7 4770 with a GTX750Ti, probably not a good enough GPU for such an epic CPU.
I'd say the Core i5 4670 with the GTX760 is a nice build, but with a GTX770 would be even better.