Antec High Current Gamer M Series HCG-620M 620W
OCZ ZT Series 650W
(a lot cheaper)
SeaSonic X Series X650 Gold (SS-650KM)
(better, similar price with promo code, fully modular)
~650W should be plenty unless you want to OC the absolute batsh!t out of everything or plan on SLI.
There's no point in going total overkill like 800+W, unless you want to keep the PSU for like 5 years a.k.a. multiple system generations (if the PSU lasts that long that is)