I dance too, or at least I try to do so, I am an older (47) beginner and love classical ballet.
What I notice is that the most camera's are to slow to create really nice pictures of dancers in action. Look all of the camera's are able of taking excellent pictures, but mostly in this case I would recommend none of them.............it's the glas you are interested in, you need excellent glas, objectives or lenses. The Canon 50mm f/1.2L or one of the Nikon equivalents of them. And they cost a lost of money.
Then, the easiest way to get really good dance shots, is when they are not dancing, but posing. When you/they stand still. Examine your dance, make a movie of it, and then carefully watch it and when you see something you like stop it at that moment and pose that position for the camera. Than you can do it with every mentioned camera above without a very expensive lens, than you can work with a 85mm f/1.8 (350 euro), also very nice for portraits.
