Good Forum Hostings for Gmod Communities?

I'm looking for a good and preferably free forum host for a community, it would be awesome if it had steam integration, I mean, if you could log in with just your steam account to prevent duplicate accounts, and the most important thing all, that I can have my own domain and NOT something like "CommunityNameDOTXForumsDOTcom" or something like that. What would you recommend?