The pay is one thing, the next filter for Australian PhD students though is that if you want a job in academia you probably have to go overseas, at least for a few years as a postdoc. You may also get paid shit all as a postdoc depending on where you go, and then your position will probably only be for 2 years then you have to find somewhere else.

Will you be able to come home eventually? No uni has any money to hire permanent staff so good luck!