L'aviateur,
When you get to Sydney, get a copy of Aviation Trader, there are always advertisements for group ownership, at least one at Bankstown has been around for over 30 years.
Re. Camden, lovely spot, but make your own evaluation of the Schools. Bob Curtis no longer runs Curtis Aviation.
You need to check out the activities of Recreational Aviation Australia sanctioned operations, there is no UK equivalent, they can be much cheaper than GA operations.
Somebody has already mentioned The Oaks, quite near Camden. The cheapest place to fly in the Sydney basin.
Don't pick an area to live in Sydney, based on where aviation is happening, that could be a big mistake. Get to know Sydney first.
Minimizing commuting to your job is more important than weekend travel times.
Tootle pip!!