Heron, Cherub, 18ft Skiff, Supersonic 27, Chieftain 38, NS14, 29er, Bavaria 34, Formula Fifteen Skiff (see link to class Facebook page which you don't need to be a member of Facebook to view)
www.facebook.com/Australian15footers/My father built the three Herons I sailed as a sub teen. Youngest skipper in the Nationals in '67. They kept telling me I had to go and get the skipper to sign on for each race.
Cherubs were a great class to be in during the 70's. I built my second one from scratch and rebuilt two others.
My 18ft skiffs were sailed with the Double Bay fleet, but were old and cheap, so never ear the front.
Sailing a 29er as a middle aged adult was fun, but they had their limitations when my son's sporting ambitions went in a different direction and I had to sail in a fast flowing river (where they didn't have the power to go out and play in the tide until the wind was over 12 knots - running the shallows with the gennaker goosewinged and board up in among the NS14's was the pits).
For a cruising yacht still using it's original decade old cruising sails, the Bavaria was a remarkably slippery boat, often able to run down and beat similar style boats up to 10 ft longer.
But by far and away my favorite has been the twin wire Formula Fifteen skiffs. I've learnt more about how to sail well in the decade I've sailed them then I'd learnt the 40 years that proceeded that. I'm in my mid sixties, and still loving it. Partly because they're a small class with absolutely top notch sailors, so there's a constant chance of learning and testing yourself against the best.