DC4326 :
Hmm, I was thinking about the Seasonic P760 (760W), or should I pick the P660 to do the job?
Also, will there any be a difference when I choose the 80+ Platinum over the 80+ Gold?
Both 80+ Gold and Platinum rated PSUs are incredibly efficient and even at idle, the fan doesn't spin, because little energy is expelled as heat. This gives the advantage of a silent PSU and saving money on energy bills. It's your pick as both units are of amazing quality, but to be safe, buy the 760W, as that'll give room for upgrades in the future.