I'm at UQ (Brisbane) and picked here over Flinders as an American. Usyd and I had mutual distaste for each other.
First, I think Flinders does the best job at being attentive to int'l student needs and the school has the best organized method to get grads back to the US (e.g., electives agreements with good US schools). I also liked the interview and the dean of admissions. It's also 100 students/yr as opposed to 300 here at UQ (but for labs and tutorials we do break down into smaller, or even small, groups, and some see the bigger class size as a social advantage).
Yet after coming to Australia to do interviews, I chose Brisbane because I don't mind putting a little extra legwork into gaining US residency (plus will be GP and so am not too worried), and environment/weather was that important to me -- spent too many years in a city I hated, and I just couldn't see liking Adelaide. The city shuts down at night and is IMO ugly (flat, grid, straight out of a '50s timewarp). The water's really cold, too, but then again the beaches are an hour away from Brisbane. Fortunately, cost of living is about the same (cheap, even though the US $ is weak), so I rented a house with a pool
😉.
Read all the archives on the Australia schools here at SDN, find out all you can on PBL, read about the schools' admissions requirements at:
http://www.acer.edu.au/tests/university/gamsat/intro_gmac.html
Keep in mind that you can get an interview at one school that exclusively uses the ACER application (UQ, ANU, Melbourne), along with any schools that have their own app (USyd, Flinders), so 3 interviews total are possible.
I'd highly recommend coming here to visit the schools -- I did for interviews, and I ended up bumping my 1st choice to 3rd, then swapped the other two, and like where I'm at. Of course, haven't gotten back my first summative exam yet which half the class is certain they failed...
I am more easily reached via PM and would be happy to answer any other questions.
-pitman