Also try to think about what you might like to specialise in, the different universities have different strengths.
I know ANU is good for interntational law and public law, this is mainly due to its location. Also you get to regulary mingle with the high court judges who love to throw balls for law students.
I know that Sydney is the best for criminal law, but I don't know what the other universities strengths are.
As for people who diss Canberra, have you even lived here? Canberra has a great mood to it, its like a big town. Its easy to get around, traffic is non-existant, night life is good and sure there is no beach, but the time it takes to reach the beach is probably the same it is in Melbourne or Sydney considering the traffic you guys have to get through.
It gets very cold and it gets very hot, but I love it, and everyone I know from Canberra loves it too. Even exchange students prefer the atmosphere of Canberra to the bustling cities. Its small but its a great place to study, and seriously to have fun all you need is a few thousand students in the same few blocks and you'll have fun.
I have most experience with ANU but I'm sure that depending on where the university is, will vary its focus on specialities.
