There is an Auster at Tyabb and Nick Caldwell gives instruction in it through Peninsula. There is also a C120 which may or may not be available.
The Auster is an interesting aeroplane and, if you master it, will have you well qualified to move onto bigger stuff with confidence.
For an aero endorsement, a Decathlon is a good workhorse and David Pilkington would have to be one of the best choices as a driving instructor. He is pretty mobile and works out of Moorabbin, Lilydale and Tocumwaal from memory.
Kaz