Well I believe MBA in Australia would be among the top 5 destinations globally.
In regards to the top univs you could say,
University of Melbourne
Monash University
UNSW
UTS
Macquarie University
Univ of Sydney
University of Queensland.
The above are some of the top univ's though not in ascending or descending ranking and all of them require GMAT.
If you looking univs without GMAT i dont think any of the above would fit the bill. As GMAT and work ex have become a requisite in Today's MBA.