I can definitely go with Houston being the best of those teams, and I would say that Dallas is the worst. The Mavs really look like they have know chemistry this year.
The other four teams are all playing on the same level. I'd say that Denver would be slightly better than the rest, but the other teams could get better depending on if Oden starts to get an offensive game (and doesn't get into foul trouble as much), Boozer comes back and wants to play defense, and the Suns get their act together.