Thanks everyone for your opinions. I have seen recently many developers still releasing greater gains for this card in particular. I have the option to buy 60 of these this week and for those who asked, yes its the blue version.
Not looking for super short roi but 1.2 years and really low electric draw is my hope for these.
Have you considered to buy 20-30 Vegas instead of 60 RX580? You'll be getting the same hashrate with much lower el. bill, using less space/hardware.