Personally I can't rate the Corsair models even the AXi units highly at all. All of the models I had died and to be honest where junk in comparision to the previous AX model range, that I may add I have 2 1200w units still working flawlessly..
Over the years I have drawn away from Corsair and I have been buying EVGA model units. Some have been the smaller 650w G+ models up to the T2 1600w unit. So far, I've had nothing but a simple and easy ownership of each of them.. They just work much like my AX units still do.. Very happy with them
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I'd always suggest going a little higher than you need with a PSU, simply because of the efficiencies they suggest 50% etc, but as you've already mentioned some headroom in case you change setups and need some extra power..
Definitely a solid thumbs up from me from EVGA and a thumbs down from Corsair. I hear nothing but good about Seasonic as well. JonnyGuru is also the place to visit when you want PSU advise I think. Personally, I feel it's the only place to visit