I think I might not be completely following here - are they managing the servers, or are you? What kind of access do you have on the actual machine? Do you have root to keep things up to date, run your own firewall, et al, or do you have to rely on them to do it for you?

I hope I'm not coming across wrong here, I'm not trying to rain on your parade, just curious about what you're up to. :) I was considering selling off some of my unused space on a few of the servers I manage, but honestly I don't think I want to deal with the hassle of running the sites I already run (including an MU startup) and having to deal with the unknown variables hosting other people presents. Too busy already.