Hi Chris,
I can tell you that I have my server with PowerDNN.com and they do a great job. Whenever someone asks me that question my answer is PowerDNN without blinking.
They are not the cheapest out there though. On the contrary, I think they are the most expensive one, but the kind of service they bring to the table is really worth it.
When transferring sites to them they will offer to do the transfer on your behalf, which can be invaluable.
They have also expanded their services to WP, Joomla and Drupal under their new brand called Managed.com
Give them a try. Really worth it.
Full disclosure: I have some level of affiliation with them, but I would only affiliate myself with the best :)
Cheers,
Aderson