you can go to a 10" pot....I have used either clay or plastic....azalea pots...the short ones....and they do well....its a bit harder to work around a great big monster plant, so I tend to bust them up.....as bil said...they like BIG HARD BARK! no little stuff!
Yeah the beauty of that is you can't overpot, and you can't overwater if the medium is just large bark.