Try a gyroplane...also known as gyros, autogyros, gyrocopters etc. Different from either f/w aircraft or helicopters, in fact a bit like a combination of the two. And tremendous fun. I think I have a total of about two hours over three flights in two different types, and considered doing more. About the same price as the cheaper f/w aircraft too.
Main snag is lack of availability - only about 7 schools in the country. Have a look at the British Rotorcraft Association's website for details, airfields, instructors etc (anyone know the URL?).
It's up to you, but if you want something different, I'd go DIFFERENT - ie, helicopters, gyros, seaplanes, balloons, flexwing microlights or possibly gliders. Tigers and cubs are lovely, but apart from giving you an inferiority complex about your takeoffs and landings, I don't think you'll find tailwheel aircraft all that different - I didn't.