You should provide hosting services to others with rigs in your area
for a fee = no risk for you.
Whatever gear you buy now might not make a dime in a couple of weeks.
If you do fill the entire 10kw, will you live in the same place? With all that noise and heat?
Think it trough before you go spending any money.
If you must, buy high end cards that fit your budget and read this forum a few hours a day and you'll be a pro
like everybody else around here.
rx 570/580 are your best bet with the important nvidia coins getting asic attention.