Hmm, well a 770'd probably suffice. I have one and I consistently get 100-130 fps in vanilla, and I wouldn't think seus shaders would drop it below 80, though maybe it is that intense. Hmm, maybe I'll install it and report the results I probably wouldn't get a 780, just cause the price to performance at that level is just about atrocious, though if money really isn't any issue whatsoever then I mean why not.
Oh and as for a cpu, I would definitely recommend the K version, as you should consider overclocking, especially if you have a all in one liquid watercooler, which are the best things since sliced bread. I'd also recommend i5 over i7 as they have identical framerates in games, though you may find some slim benefits with video encoding and the like with an i7.
I can speak from experience when I say that if you have an EVGA 770, and an i5 cpu paired with a Corsair H100i you will literally never hear your computer.
EDIT: I installed the seus shaders! and my goodness are they pretty. Anyways, I personally wouldn't bother with anything above a 770, at least for this requirement. I hovered around 80fps, lowest I ever saw was like 60, but was largely 75-100 fps.
