Replace the i7 with an i5 3570K, the Maximus with a Gigabyte Z77 UD3H.
You dont need 16GBs of RAM for gaming. 8GBs is more than enough. Make sure to get the low profile ones too.
Get the Professional 750W from Corsair. Modular PSUs reduce clutter in your case.
Closed loop systems are crap. Dump that H80 or get a real watercooling system. Get the Coolermaster Hyper 212 EVO instead.
Lastly, replace that GPU with a 7970 GHz Edition. Faster than the 670 and overclocks like a beast too. One from Powercolor, Sapphire (Vapor-X if you can get it), or XFX.
Trust me, you will still have a beast of a gaming machine after all of these changes.
A big beast at that. Big. And. Powerful.