Hi Guys! I would like to ask for your help.

I would like to start mining, but I can't decide which card I should buy, tried to calculate it by Whattomine, but because of the spikes of different coins I had crazy numbers I think.

In my country these are the costs of the GPU-s.

AMD 570 - 300$
1060 6GB - 350$
1070 - 530$
1080 - 580$

And the base:
Asrock H81 PRO BTC
Thermaltake 1200W Toughpower
Intel Core i3-4170
4 GB DDR3 RAM
Costs: 490$

And my whole budge for it is 1870$

Thanks!