I want to build my own rig for ETH and i have dillema about graphics cards, which one to buy and use.
I would like to hear your opinion about this cards:

1. EVGA 08G-P4-5173-KR GTX 1070 SC Black Edition ACX 3.0, price 495,70€

2. EVGA GTX 1060 SSC GAMING 6GB GDDR5, ACX 3.0 & LED (06G-P4-6267-KR), price 343€

3. SAPPHIRE RX 570 NITRO+ OC 8GB PCIe, price 300€

You can also sugguest any other card. What's important data on graphics card for ETH ?
Is there any graphics card calculator for ETH mining ?