i like that you say all this.. cuz i just purchased 5 asus r9 280x's for $330 each and 2 seasonic 1250xm psu's. sounds like you know your stuff and it sounds like i made the right moves =-D
r9 280x = 270W * 5 = 1350w + 200 for the other stuff = 1550 and you buy 2*1250 ? + 950 watts ?