I almost forgot something: you said that you just want a PSU that won't be a pain in the rear end and to be as good as the money you spent on it. Right? I know that you've had some pretty bad experiences with PSUs sfar, but what you are looking at are at the very end of the "very best" spectrum. If we have the worst on the left side of the spectrum and the best on the right, then PSUs like these are as far to the right as you can get. They almost need to extend the spectrum for these. So, the only way you'd experience any problems is if you were to somehow get a defective one, which is extremely unlikely with these.
Anyway, the only thing about a 650W PSU is, you wouldn't be able to have like two GTX 980 Ti's or R9 390s.