@lunyone
Instead of suggesting my own build, I just want to say that I'd strongly recommend switching out the Samsung 840 250GB for a Plextor M5S 256GB.
http://pcpartpicker.com/part/plextor-internal-hard-drive-px256m5s
It only increases the price by about $11.50, but you get a significantly faster drive (granted that's arguably not important for a gaming system) with significantly greater endurance for the NAND flash.
I'm not saying that the 840's lower endurance necessarily will cause issues, it probably won't, but by my calculations with it, it's pretty close to being dangerously low. The small cost can be offset by a cheaper DDR3-1600 2x4GB memory kit if necessary.
Also, do you have experience with the V3 models of the Corsair CX series? I ask because I can't seem to find any professional reviews of them. The V1 and V2 models were pretty meh, but the V3s are rated for more power delivery and better efficiency at each wattage point, so they seem better. I'd just like some confirmation on them being better other than rated efficiency and power delivery, if anyone has any to offer.