There's a misconception underlying all this is - that you need to OWN the place, and the equipment. Stupidly expensive, IMHO.
It makes a lot more sense to go use someone else's when you want to, even for a modest fee - when there are setups like this available
http://www.loweobservatory.com about 4-5 hours from Sydney.
Then live wherever you please 99% of the time.