750w isn't neccesarry, those recommendations are always overrated(assuming you use a no name brand PSU), in that review the whole system draws 460w in the most heaviets situation possible. So a quality 520w is ok. Normal gaming load is with a OC only 347, good thing we don't play Furmark
Edit: That 750w is a good one, but you really don't need that much wattage. If you want to use a second one in CF later on get ~800w.