Nice setup! Out of curiosity, what's a standard rate for your colo? The lowest rate I found is $135/m/device but they want a year-long contract. That's no beuno...
Have you found anywhere that will do it for $ 135 per month that is accepting new miners? I been having an issue finding a colo that is open (and looks reputable).
As for power. My calculations are that a miner will cost (at 10 cents per KWH), around $ 100 per month in electricity. I know everyone can get electric at 6 cents per KwH, check your bill. Delivery fees, admin fees, and your "out the door costs" are likely at 10 cents per KwH.
So if my electricity costs $ 100 per month, I think if I could find someone to deal with all the noise, cooling, etc, for $ 35.00 per unit, I would do it..
If you find someone hosting for $35.00 a month and .10 cents a kw/h you've found someone doing it at basically a loss. You have to think about all the things that go in to a *real* hosting facility. Bandwidth, virtual security, physical security, air handling equipment, electricity costs for lights, network gear, air handling equipment, the building, taxes, insurance, etc, etc. It's not trivial
Now if you find Fred the internet hero who says he can do it in his "building" I'd be very, very cautious.