Rackspace is the best that our company has ever used. The expense is a factor, though, and many smaller sites aren't willing to bear that burden and that is where the likes of Media Temple comes in. They host most of the smaller sites we manage and I've been quite happy with them. That said, anytime I've had to deal with GoDaddy it has been a huge pain in the ass and I am not confident that this move is a good one for Media Temple's users.