a new instructor has joined my studio - a very good one from the little I have seen. Is it reasonable for me to expect to continue my contract with my original instructor? We have been working on a specific goal, which I don't want to "backtrack" on - and there is a big difference in height, meaning that it will be a little less comfortable for me

Pat ,a sticky situation since your present teacher will be insulted and will cause tension in the studio I would think. Never sign a contract If they wan"t your money they will not force you if you put up a strong enough fight. They will say we can't give you a discount if you don't sign. So you say that's fine I'll go else where. Remember it's your money and you are the boss. As for liking a teacher I would rather have one who I don't like if he can teach me to dance well. B etter still one I like and can also teach me to dance.