Hi dude !
Few week ago i buy 12 Nvidia 1060 3Gb GPU, after few week of mining on Ethash i can tell you it's very great cards, easy to overclock, low power usage, i make between 23-25 per cards, at the wall by rig of 6 cards i have 800w !
i have few rigs on AMD too, rx 570 and rx 480, for AMD my hashrate is between 28-30 Mhs on Ethash, on a rig of 6 amd cards i make between 950-1000W at the wall.
to reply to your question, i mine from 1 years and it's very profitable and with GPU miner you have some choose on what coin you want to mine