Drop the Snaggletooth, spend about $150 on a mobo (tops). ASRock Z77 Extreme4 comes to mind... You won't be able to tell the difference.
You only need 2x4GB 1600MHz 1.5V RAM for ~$40. You won't be able to tell the difference.
Get an ASUS Xonar or Creative X-Fi for less than half of that one. Won't be able to tell the difference. If you eliminate it completely, might be able to tell. Better to try without first and add if you need to.
I'd also recommend dropping the liquid cooler and getting either a $35 Evo or $80 DH-14 but again there are diminishing returns.
Or, if you have money to burn forget all that, move up to the 3770K (maybe change to an X79 hex core?), add pull fans to the H100, and change the SSD to an 840 Pro!
In short, go balanced across the board or go all out
I love my Evo but if I wanted to safely overclock the hell out of a a 3570k I would buy a Corsair H100i or Phanteks PH-TC14PE, otherwise a Noctua NH-D14. This chart compares heatsinks/stock fans of them on a i7 w/ 570:
Not surprising, on a budget, the CoolerMaster Evo is great, but if you want to push your system the Evo is not good.
Get an extreme 4 z77 at microcenter. They will give you $40 with the 3570k purchase so $95. I also recommend upgrading your monitor to an Auria 27" 2560x1440 @microcenter. It's $400. I can't see my bios with mine through DP, so you might want to make sure you have a tv or other monitor to use at first.