Change the CPU cooler to a CoolerMaster Hyper 212+ or maybe a Corsair H50 if you like water cooling.
Change the WD Black with a Seagate Barracuda 500GB. Cheaper and slightly faster.
The Asus Maximus is fine. But ASRock released their Gen3 Z68 boards a few weeks ago featuring PCIe 3.0 slots. 100% Ivy Bridge compatibility guaranteed. That also costs about $130, cheaper than Asus.
Other parts are OK. What speed is your Ripjaws? I'd recommend 1600Mhz with CAS 8.