These days RX series became easy to purchase, I personally recommend AMD GPUs.
But among those cards I recommend 1060 6gb, which has best cost efficiency.
3GB version has limited life for mining ethereum because of increasing DAG size.
Hello sev18 , Thanks for your replay ,
I don't mine ETH in the moment , I'm mining zcash , do you think think the 1060 6g will make much differance than 3g