I read somewhere that the Harvard has the same power/weight as the Tiger Moth. Not having flown either I'm not sure whether this statement is meaningful except for the mass and fuel burn
Rugbyears - I recommend both tailwheel and aerobatics endorsements. They will help with your airmanship asiude from being wonderful fun.
Ultralights are also heaps of fun, challenging in their own way and for pure flying enjoyment. The Maxair Drifter taildragger especially. Perched on the end of a broomstick with nothing around you and getting airborne for the first time

is a unique experience that I can highly recommend.
Personally I've had as much fun flying Drifter ultralights low and slow in the Philippines as the various types of Pitts S2s that I've competed in.
Stampe and Cap10 are on my taildragger wish list.