if you are looking for a good price and efficency you should choose the gtx 1060. you can run up to 24 mh/s on ethash (+- 90 watt) or 330 sol equihash (+- 100 w) even with the 3gb version. since this whole dag thing doesn't matter anymore you can mine with the 3gb at least 2-3 years without problems.

this is a good choice if you have high energy cost in your country.

if you have a little bit more money take the 1070 ti - incredible card