Alright time to change some things up.
Motherboard, CPU, case, and monitor are good.
Don't get that HDD. Velociraptors are slower than an SSD, and not much faster than a standard HDD. Get an SSD/HDD setup. 120 or 240GB SSD and a 1TB HDD for storage.
I would get a 120GB Corsair ForceGT, Neutron GTX, Force GS, or Samsung 840pro and back it up with a Seagate 1TB Barracuda.
Get a standard 1600MHz 8GB set of RAM. You don't need anything higher than that for any rig. Anything above 1866 is aimed for benchmarkers who put their CPU and GPUs under subzero temps.
On to the PSU. 850w is way too much for a single card setup. Actually, I recommend getting the Corsair HX750 instead as it is modular, gold rated, and will handle even SLI 680s.
Finally, with a budget like that you want a better video card. All games are pretty much all GPU dependent. If you want to go triple screen you will also want more horsepower. I suggest getting this.
EVGA 04G-P4-2686-KR GeForce GTX 680 w/ Backplate 4GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready SLI Support Video Card - Newegg.com
You will need the extra VRAM for 2D Surround (three screen gaming) and future games. Just as a hint, Surround sucks BTW. I played a wide array of games just last night on Surround and it's pretty retarded IMO. Diablo 3 looked stupid as you could see certain things pop up on the outer screens because they didn't program it for Surround gaming. By things I mean enemies and textures.
For overclocking on the 3570k you will want to start out with something like an H80i or equivalent to make sure your CPU stays cool if you accidentally set too many volts or set it too high.