The problem is, here most of the "higher end" PSU's are hard to get... The levels seem to be that the weaker ones will be universally bad from even the best manufacturer, and the absurdly strong ones are of highest quality.
Just take a look here (don't worry, i set it up to the PSUs so you don't have to look):
http://itsvet.com/napajanje-pda1-57.i
https://www.pcberza.rs/komponente/napajanja-napajanja/235/
The ones that are according to here, tier 1 and 2 are almost always ludicrously overpowered. As you can see, basically all that is sold is Raidmax - and not the new ones that are improved, but the ancient ones. And to dabble with our version of ebay I would refrain
And yea, any gaming i'd do would be at 1080p at max settings, the rx 580 strong enough for that