if you got the money and space get the gamexstream, they have really high efficiencies, only downside its not modular tho. corsair hx620 would do you as well if you got the money for it.
and if you want a good budget psu then this one is good also, its modular too. 700w one is £64 i think but then again the hx520 from corsair is the same price including delivery so its really up to you.