I am a big Badger fan myself.
I have a Badger 100 and a Sotar 20/20, both are dual action, internal mix brushes but the Sotar has gravity feed instead of sypon, the advantage there being that you can spray with low air pressure. The Iwata's are great brushes too from what I hear. The reason I went Badger is that parts are cheap and easy to get, not that I've needed any. I just sold my Aztec A4709......