Yeah, so here there are available psu's of many brands, like: cougar, coolermaster, evga, gigabyte, corsair and thermaltake. Differents 80+ and wattage, I'm thinking in a 80+ bronze of 550w (any good brand) but I'm open for suggestions.
The asus rx570 rog strix is at 311 USD, the 580 is too high...