I am aware of VPS/Dedicated server options, and addressed that in my comments. They're a good fit for me personally, but not for my company, whose clients want to see long lists of well-known clients for their hosts. Rackspace has that, but their only managed solution other than a dedicated managed server is the cloud. Media Temple also has an impressive client list, but it's the same boat.
I'm just frustrated that I have to considering moving 100 sites again when I just went through this a year ago, specifically because the one thing the cloud keeps promising is performance and scalabilty and that's the one thing is sucks the most at. Its amazing to me that more people haven't called bullshit on it.
Fabulously, we only have a few sites on the box at work, so moving them will be easy enough. We're on a managed dedicated box at The Planet, which has been okay but not ideal. My own personal server, for which an impressive client liist is less important, has a huge pile of sites that will take forever to move. Again.
Also, s/his/her/.