Buying hosting companies?

Hello, I wanted to know what everyone's opinions on purchasing a hosting company were.
When purchasing a hosting company did you just want the clients? Or the name and brand?
What experience have you had with buying and or selling hosting companies?
How have you dealt with balanced between the companies and or migrating them to your current company?
Where is the best place to go when looking to purchase a hosting company?
@krion I don't have a budget. It was a general question and something i wanted to look into. By all means pop me a pm and we can discuss further. If your offering to sell a company?