newbie here please help me building my first rig

[ccoldfire]

Hi
i want to achieve 150 mh/s and am investing 3000$-4000$ for mining ether ,i live in Iraq and am not sure if i can find the right gpu for this,after googling for a week i understand that u r using raedon 480 for the low price or gtx 1070 for the low power,so i have these questions if u dont mind

1-should i go with the 480 or the 1070 ? if i found both,or do you suggest something else? asking about the performance side not cost.
2-i want to make a rig with 6 gpu's,so lets say i went to get six cards of the 1070 and i only found 2 ,in that case what should i do? can i mix it with another model?if yes,can you suggest what to mix it with (as i mentioned b4 i want to achieve around 150 mh).

thank you