I manage a fairly small data center in the central US. We have roughly 30 servers including vmware, san storage, hp servers, cisco equipment, etc. The companies' owners are looking at future acquisitions as they are becoming more of an equity firm. We're aiming to host our data center in the cloud and moving from PPTP to an MPLS solution between sites. An environment that will be a lot more flexible with changes associated with an equity firm. Not to mention the disaster recovery.
With this, we are doing a complete cost comparison between hosting our own data center and the offers placed on the table. Only problem is this can take upwards of 2 to 3 months to finalize a single quote. To save some time, I'd like to hear from other companies that have done the same.
Note: We will only have to co/lo two servers (our servers sitting in their racks), the rest can be virtual.
Note 2: Do not need your annual rate as it obviously differs, however, if you have some input such as, "They were the cheapest of the lot", that'd be great.
A) What company do you use?

What is your opinion (general response time, professionalism, etc)?
C) Where are they located (don't have to be too specific, just a general region)?
Thanks in advance.