We have found over the past ten years of buying and selling domain names. The best domain names to buy and resell that we have the most success with are the real estate domain names. The domain name would be the suburb plus real estate, for example, taringarealestate.au
Here is also an article re suburbs in Brisbane that may give you some ideas but I am sure you may have some suburbs that you feel would work.
What we are looking for is a suburb with a number of Real Estate Agencies in the area. The more agents the more demand for the domain names.
Have a think on a couple of suburbs and drop me a line if you want more information and we can do an expected resale value for the name.