Thanks for your help / advice guys... always better to hear other peoples views.
I am hopefully planning add 2 x AMD rigs to compliment our existing 580 rig...
and then start adding Nvidia rigs aswell to make a mini farm.
I have not looked into the 1660ti so I will do some research into these... but its looking likely I will have 1070 and 1660ti rigs going forward.
Do you guys mine to coinbase wallets and extract onto a Ledger Nano or sell/trade weekly/monthly?
Thanks
Another Card you should look into is latest AMD RX5700/XT , Very efficient mining ETH about 60mh/s at 100watt.
Best To use ofcourse is some ledger wallet, but if you want to wash them trough exchange. Use some exchange where you can deal without KYC

Think Binance has 2k daily limit without KYC