System looks good from here. Throw in a Corsair Hydro H100 for simplistic cooling and you're set.
Also, any artifacts or lag you may or may not notice on MAXIMUM settings with one card will most certainly go away when you go SLI.
^+1 @nordlead. You might also consider a Seasonic PSU; both brands are excellent.
Coolermaster still sells some PSUs with liar-labels on them, either overrated or missing claimed protections. That's dishonest, so I do not buy or recommend ANY Coolermaster products. Fortunately, you won't cut off your nose to spite your face by taking the moral high road. Nothing CM makes is not equaled or bettered by someone else, for the same or a lower price.
Take a look at Rosewill's cases, specifically the new version of the Challenger with USB 3.0 ports: http://www.newegg.com/Product/Product.aspx?Item=N82E168...