I'm going to assume the lack of speedy responses is due to how awesome it already is right?
What will this be used for? i only ask because I feel you can get better parts for your budget, depending on what you intend to use this for.
Kinda pointless to have 4gb on a 770 gpu, because its really not fast enough to do 4k very well. You need around 6oow psu, so 900w is way over.