Ask YC: Good Lisp Hosts?

We're in the early stages of our app and just recently decided to write it in Lisp (we started out with Ruby, but given what we're doing, Lisp began to look like a very good fit).

Anyone have experience with a host, good or bad, that they'd like to share? We've got a couple hosts in mind, but if anyone is going to have good tips on this, it's Hacker News.