Im not looking to spend $40 000
but i need a recomendation

im building a rig and cannot decide

4x 1070        $ 2151   120 MH/s   $432 /month     1880sols   $369 /month
5x 1060 6GB  $ 1807   117 MH/s  $429 /month     1650sols   $317 /month
6X 1060 3GB  $ 1743   135 MH/s  $500 /month      1770sols  $340 /month

as much as i would like to buy cheapest version with highest profit,
i am also concerned about the selling price later
not many gamers will like 3gb version of 1060 even though 6gb is not a big difference on 1080p res.
and 1070 will probably also drop in price quite a bit..

but im thinking, 3gb will not become obsolete for mining before ETH hits POS so i should be good then, and even then i should be able to mine zec at higher hashrate with more 3gb 1060s ?