I came across those two hosts quite a lot (Dreamhost & Media Temple) quite a lot, and they seemed pretty good.
I'm about to sign up again and renew my contract with 'supanames' which I've been with before, and are excellent. But yeah, don't want this to be a hosting showcase ;)
If you contact the hosting admins of media temple, they may direct you to a link which can transfer your domain and server information over to your package. Most hosting companies these days have that facility and option.
Good luck with your new host