I have a 850w PSU that came with a case for £40 in my build and has never let me down. I run a i7 6700k, gtx 1060 6gb, k55 water cooler, 8gb ddr4, 250gb ssd, 2tb wd blue, 1tb WD blue. Case is a nzxt noctis 450. So I guess the choice is up to you my PC performs great and I haven't had any issues at all