OC is the only way.
Time to grow a pair. That is going to be your major bottleneck right now, no question.
So, where I said a lot of people are going to tell you 'don't waste your money', here is where I say 'this is how you maximize your money'.
First things first is that NVIDIA/Kepler does not officially support PCI-E 3.0 on X79/SB-E (AMD does though, how 'bout them drivers AMD haters?). There's a chance that your motherboard will properly flash to support it, but there's also a chance that it won't. Since you are planning on that kind of a setup, I'd immediately suggest swapping to Ivy/Z77.
So, take a gander at the 3770K and 3570K. They offer identical gaming performance, so unless you just want to have the best processor out there, or you might be doing some multimedia work like rendering videos or encoding lots, the 3570K is definitely the best buy. In fact, it will offer near identical gaming performance to the 3930K you have selected. Pretty mind blowing, I know, but the games that are CPU bound are that way because they only use one or two threads/cores. What determines performance then is per thread/core performance, and there's basically no difference between the processors in this regard.
For Z77 motherboards (I've been doing my homework on these because I'm going to be buying one for a test bench in the next few weeks), the
Gigabyte UP7 gives you real meaningful overhead when it comes to overclocking over the other boards. If pushing the boundaries of an overclock is not your thing at all, then the only two other boards worth looking at are the
Gigabyte G1.Sniper 3 Z77 and the
ASUS Maximus V Extreme are the only other two worth looking at. The reason why is tied to what you are trying to achieve with your videocards. These boards offer the best 2x and 3x SLI options in that they have onboard chips that do a really good job of multiplying IvyBridge's native 16 lanes of PCI Express without degrading the bandwidth or introducing lag.
Next is that 2GB of VRAM isn't nearly enough for that resolution. You want 4GB cards. What I'd actually suggest, is starting with two cards and then moving to three if you don't find the performance sufficient. Since the memory bandwidth is the same on the 670 and 680, I think it's going to be worth it to rock 670s instead (
using 3x 670s myself). There's such a tiny difference in performance between the two, and the fact that the 670s are cooler and quieter more than makes up for it.
Grab these guys.
You will also want a case that will adequately cool three 680s, and the 800D most definitely is not it. The case was ostensibly designed for watercooling, and even by WC standards, is very very very outdated. As far as cases I would suggest for that sort of setup, take a look at the NZXT Switch 810, BitFenix Shinobi XL, Lian Li PC-A75X (sold out on newegg, but available from some other places), and the CoolerMaster Stryker/Trooper. Don't bother looking at reviews, because you will be buying fans to replace whatever comes in these. We can cross that river once you've selected something. I can also offer some more ideas if you have a specific aesthetic in mind.
Swap out the PSU for a Corsair AX860i. It's based on a Seasonic unit where the AX1200i is not (Seasonic = unrivaled PSU quality). It's a much better PSU and will provide way more power than your system will be drawing at load.
With all that, let me know what questions you have.