I am a firm believer in buying the best PSU available, whitin reason I guess
I have one Corsair 1200AX that seems to do a good job, but I've never benched with it, only run it in my x58 gamer. It's dead ass quiet, but I do have some suspicions on stability (haven't had time to test out).
My Corsair 750TX has always been reliable but only has 1 8-pin cpu power connector so I replaced that with a PCP&C 950w (yesterday, so nothing to report as of yet). this on my P55 Classy setup.
I'm thinking the 750TX should rock with my REX 775 setup
For my two main bench rigs (the Banchettos) - both have PCP&P Turbo Cool 1200's - Nothing short of awesome IMO
No plans to replace them
Currently one holds my M4E setup (which I have to freeze within the next couple of days) and the other has the R3E riding on top of it.
Back to your question Kiki
Brands are very important, specs are more important, and making you buying decision on what is CHEAP is the worst possible way to go.... IMO of course