jma
As well as the a/c - and as already stated here, most of the standard types are fine to start off on - make sure that the instructor that you fly with has decent tailwheel experience. Without delving into the whole " are they or aren't they more difficult" debate, the fact remains that ground handling is critical with taildraggers and you really need to be shown how to do it properly by somebody who has been there and eaten the cereal.
Good luck - its great fun!
