Antec Edge 550w vs XFX Xtr 550 vs Corsair

Hi.. title says it all.. I read and I read..probably got asked a few times but I have an old Ultra modular here that got warranty replaced with a DOA.



So Ultra's out. I'm running single card system:

R9 270x



Plan on going

intel 5930x or 5770K when it gets here.



2 hd



calculators estimate 450w. I wasnt sure if that included the Efficiency error.



but I dont need 650W Im told?



Soooooo 3 models of 550w, opinions?

Antec Edge 550w vs XFX Xtr 550 vs Corsair