Do the 6GB 1060s have the Hynix memory?
why you want choose 1060s?.
Im undecided, just curious.
Price wise, go for AMD RX580's thought its not a newbie friendly as it needs a Bios Mod and Drivers sensitive especially on Eth mining, however there are tons of tutorials out there to accomplish this, ROI is a bit faster too.
Will the 580s still be good next year?
there a lot of coins profitable out there, and still a lot of coins to be born, no need to worry about