I agree with all the comments about the Chipmunk and the Stearman - wonderful aircraft. Like FL, I learned on a UAS Chipmunk and I have recently flown a Stearman in NZ. I also had a Harvard ride, and unlike the Stearman, which I was very comfortable in, I felt it would take a while to come to grips with the Harvard and its extra complexity.
Genghis, you should definitely fly a Tiger. I've had two flights, one in Australia and one at Sandown. Two things stood out for me - the way it climbed like a lift at a ridiculously slow speed and the graphic demonstration of form drag when I closed the throttle and didn't lower the nose. And of course, it's an open cockpit - always a good thing.
Here's an impressive demonstration of what you can do in a Tiger with enough practice and skill - an eight point roll!
http://www.pprune.org/dg-p-general-a...ml#post6327984
FL, you must try float flying - flying combined with "messing about in boats". I used to say it was the most fun I've had in the air, but that was before I had a dual flight in a Bell 47G.