I have a couple friends at Joes Datacenter, they are really low cost.
While I can't comment on quality I can say they have never had a bad thing to say against them. They also have a good reputation on forums such as WHT.
1+ for checking out http://joesdatacenter.com/
I've never colo there myself, but a friend of mine has very good things to say about them, and they have very low prices compared to other DC's. :agree: