Dyson DC23 Turgine bagless (Model Number: DC23ACTUSA)
Special available at 7 Good Guys stores I checked in NSW - around Newcastle and Sydney. I presume this is a state or nation wide special. Visit www.thegoodguys.com.au and choose your local store and then click on Laundry -> Vacuums.
I bought another much cheaper vacuum cleaner for a friend at the same time and bargained another $50 off each item.
This has a "turbine" head that runs on air pressure, not a motorised "power head" from the more expensive model that currently retails for over $1000. I personally am finding the turbine head just as good as a previous motor driven power head on another vacuum cleaner that just died. Seems to do a great job.
This model gets rave reviews at places like http://www.productreview.com.au/showitem.php?item_id=65154