I just set-up my rig last night.

All cards are brand new.
All drivers have been updated. (Using GeForce experience.)

Motherboard: ASRock H81 Pro BTC R2.0 (UEFI driver 1.20)
OS: Windows 10 Pro
Graphics Cards: 3x GTX 1060 6GB (3 MSI Gaming X)

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I'm mining using NiceHash for now.

I'm getting a total hash rate of around 66Mh/s @
75% TDP, +600 memory clock, +100 core clock (per card).

I will be getting another 3 GTX 1060 6GB MSI Gaming X in the next 2-3weeks.

What would be the best currency to mine and best miner?
(I don't want to go higher than 80% TDP per card.)