Anything over $300/kW/month for the total package sounds like high-density colo with clean uninterrupted power to the cabinet. This is definitely not cost effective for mining.
I live in Texas and have a locked in 0.085 residential rate (yay, deregulation), which isn't the best in the world I admit. I researched the multiple co-lo's in the area and I could save a penny with commercial service, but the added in cabinet space and limitation on kW per rack added in an additional $100-200. Since most of the co-lo's here are geared towards oil/gas, there are very few low tier providers. The ones that do exist have no bitcoin mining policies, heh. I guess they oversubscribe the kW allotment and don't want people that use the max like most residential internet providers.
Ufo
Actually, Texas is rather overbuilt with datacenters, especially Dallas. If you wanted wholesale space, say an entire suite of 7200+ square feet, and provided your own racks, you would likely pay $130-$150/kW/month. The "no bitmining policy" have sprung up due to data centers being left out in the cold when prices dropped. I've been in centers with rows of S1s powered down - just abandoned with back rent due. The mining company folded and left the datacenters to suffer.
If you expect the data center to provide more than space, power, and cooling (like racks, network gear, overhead cable trays, etc.) - expect to pay more.
Note that every colo has their own pricing model. Some charge for space, some for power, some for both. Some measure power by metered rack, others charge by power whip, still others include a base usage with a cap. Some require you to pay for a "reserved" amount of power you will never exceed. Some have fairly heavy setup fees, some roll that into their monthly charge. All want long term commitments with a 3 year lease being the minimum and a preference for 5 to 7 year leases.
If you can find a new data center built about 3-5 years ago, you may find one with excessive power capabilities that will cut you a deal. Many data centers back then figured new clients would need 8-12kW/Rack, when in fact, most customers average about half of that. So they have power grids, UPSes, and Generators designed to support about twice as much power per square foot than what they can sell. Power hungry bitminning could help them balance a bit. Downside is that most of those folks also built themselves concurrently maintainable space with 100% uptime capability. That is a feature that cost money that bitmining doesn't need nor does it want to pay for.
Yeah... I help find data centers for companies for a living...
