I would change a few things . i would grab GTX 760 instead of 660 & do you realy need to overclock your CPU ? if you dont then go for Non k series cpu & H series Motherboard which will cost you alot less & youll get GREATTTT performance ( my own experience ) ( Z series are for overclockers ) . IVY bridge can already maxout any game for you why going for crossfire & put ur cpu in risk
for example GTX 760 + i5 3470 or 4xxx & that PSU is WOWWWW . all you need is 685 or 700watt
but if your going to overclock or Sli then its a good choice bro
Well, I would change the GPU for like a 770 or 760. overall pretty good though. It seems legit. Well since I'm rich as a MUDDA FUGGA I'd GET A TITAN AND A I7 4770K.