its a nice build. you could swap one thing for another and be a touch better off but you would never feel the difference.
you might notice the money missing and if so.... you can save $50 buy buying the cpu at microcenter if you have one near you. its a in store pickup only. this takes away your combo discount on the cooler but its still $40 in savings.
you could also go from 780 to a 770. its 64% the cost and 90-98% the performance depending on game. its a WAY BETTER deal