I'm not familiar with Raidmax so I don't know if that's their one good PSU series. I wouldn't get that though.
Look into a Seasonic G, Rosewill Capstone, XFX XTR/TS, EVGA G2/P2. Get whichever one of those is cheaper in the 750 or 850w variant. I would get 850w if you plan on doing some high overclocks, 750 will be enough for stock. If you want to overvolt then look into 1000-1200w.