No FPS changed in i5-i7.
i7 is meant to serious video editing since it has HyperThreading.
i5 is enough for serious gaming.
7970 can overclock for almost faster than GTX 680.
If you can afford GHz ed. It's already the same as the GTX 680.
And, if you OC the GHz ed., fly!
Overall, that would be a nice build.