I know that there are also Innovas in Australia, because I've seen posts from Innova dealers in the Innova yahoo groups. I'm sure there are other brands available as well. Before taking the plunge, I would advise finding out more about what is available. You might join some of the yahoo groups and ask to hear from others in AU.
The definition of a longarm vs midarm vs shortarm varies. The most consistent definition I've heard is that a longarm is at least 18", so the sweet 16 would be a midarm.