Which US datacenter are you referring to?

In the datacenter I'm building, which should be coming online in a few weeks:

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$192/mo to $248/mo, depending on whether you pay several months in advance or pay month-to-month.

In the official Spondoolies datacenter in Washington (which should be Titan), the rates are:

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$400/mo to $500/mo, depending on whether you pay 3 months in advance or pay month-to-month.

You can see those rates on http://www.spondoolies-tech.com/collections/products.

You can view other hosting options in https://bitcointalk.org/index.php?topic=622998.