I am hosted by Media Temple, a private web hosting provider for both small and large entities on the web. I am currently using their Grid-Service, which is $20.00/month, and have configured my environment to be completely compatible with the requirements for Dolphin 6.1.4 - 7.0.

I have found their service to be satisfactory, as their support is truly top-knotch and ready at all hours, even on the most festive of holidays. Though there have been quirks with the service every now and then (which see more is expected with a new kind of web hosting environment such as the Grid-Service), they have not been too severe for myself to worry about when hosting my communities with them. They use their own web control panel, instead of CPanel or similar software, so you might be confused at first.

You can find more information at http://mediatemple.net/. And no, I am not affiliated with them in any way.