hey Skip,
bring a fat wallet back! you will need to get it converted to right hand drive, which in these later models is way too expensive in my opinion. it costs around the au$40k mark.
i think if you have been living there and driving your car for over 12 months, its relatively easy to import as a personal item (i.e. part of your furniture) and you should be able to reduce the taxes etc associated with a purchased car being imported. i'm sure its more paperwork, but well worth it.
it has been said before that its worth contacting places that do certified right hand drive conversions over here before you bring it back, in case they have some sort of objection to doing it to a car that has been privately imported.
i do not know the list of certified converters... someone should be able to fill in this blank for you...
Good luck with the move, and good luck with the conversion!
Tim