I would back what Backpacker has said, learn on an aircraft from his list and you should have no problem progressing onto Extra etc later (as far as the aeros go - flying it generally you might need a bit of conversion), if you learn on something like the Extra you will get a bit of a shock if you then end up flying a less capable aircraft. Personally I would try and steer clear of the Cessnas though, they are really only basic trainers that are aerobatic rather than trainers that have been designed for aeros at the start. Enjoy.
