Be very wary of the current vehicle importing rules, make sure you read up on them and check to confirm that you are actually allowed to bring your car in with you. I think that if you've owned it (registered in your name) for at least a year before you move then you should be okay, but there has been a big change recently in the interpretation of some vehicle importation laws, which has led to the effective banning of all modified vehicles being imported. In some cases the 'modifications' have been as little as non-standard paint or wheels. Make sure that, if you're bringing the vehicle in as a personal import, you will actually be allowed to register it here. There are people with cars sitting on the docks because they have imported them but they are not legally allowed into Australia for whatever reason.
Here's a couple of links to start:
http://www.infrastructure.gov.au/roads/vehicle_regulation/bulletin/importing_vehicles/general/index.aspx
http://www.infrastructure.gov.au/roads/vehicle_regulation/bulletin/importing_vehicles/general/pre1989scheme.aspx
Be sure to check this one out:
http://www.asrf.org.au/docs/Import-Bulletin-001.pdf
The legislation is ambiguous, which is why the recent "re-interpretation" of existing legislation has completely changed the way things work in practice. Vehicles manufactured before 1989 are allowed in, but crucially
modified vehicles are classified by the date of modification. This means that unless you can prove that every part of your car is 100% original, or you have documents to prove that it was modified to it's current state before 1989, your car can be refused entry under the pre-1989 scheme. This was never a problem until only a few months ago, when for some reason the Department of Infrastructure and Transport got very picky about originality.
