Sorry, Whirls, but those eggbeater thingies don't like going upside down, so by definition can't be as much fun as some of the aeroplanes mentioned here
Tiger Moth is good fun with bags of 'character', but it's not a good handling aeroplane, with terrible ailerons and poor control co-ordination. But everyone should fly one at least once. Try a Stampe - lovely aeroplane - everything the Tiger should have been.
Instead of the Harvard, try a Yak 52. More capable, and far cheaper (but lacks the 'history'). Skytrace at Wolverhampton (Gennedy Elfimov - Mr Yak - I can highly reccomend, having had some aeros instruction from him in our '52).
Best would have to be the Spitfire. I'd just love to fly one, but you're talking big bucks for one of those.
SSD