I strongly recommend Nexcess.

I have been using them for years and rarely needed their support as their products are very intuitive. I recently made a mistake in setting up one of my domains. Not only did Nexcess locate the source of the problems this caused, but took the necessary steps to fix it by creating a secondary domain with the correct domain name, then they copied the content from the old domain to the new one. I am sure many of suppliers would have simply located the problem and left it for me to figure out how to fix it.

Excellent support! Many thanks to the whole Nexcess team!