Hi Bec
Welcome to Rebreather World.
Plenty of Aussies on here, actually I think 90% of Rebreather divers from down under frequent these boards.
Best local people and instructors in Australia to call and have a chat too
CCRDiving: Steve James for Megs and Kiss's
Southern Cross Divers: Baz for Inspos and Evos, Kiss's
Dive Dive Dive: Jason for Inspos, Evos & Optimas, Kiss's
Image Dive: Luke for PRISM's & Optimas
Of course there are many other units on the market but these currently are the most supported Units in Oz.
Best of luck with your search.
Cheers
Chriso