George Bien, who designed the master-level trainings for the NGH, is a good friend of mine and a great instructor. Check out http://www.GeorgeBien.com.
He doesn't teach straight stage hypnosis per se, mostly therapeutic techniques, but he does teach a lot of fundamentals, rapid inductions, and group hypnosis (alot of his students went on to do stage hypnosis).
And, he doesn't keep secrets. He's an open book; he'll teach you whatever you need to know.
(Note: once you complete the training, you are eligible for membership in the NGH. When you become a member, rent out some videos by Ormond and the like from their video library. This is a much better way to learn from Ormond, since you get to review what he does over and over.)