All of G8 universities will provide you with the best standard of education and graduate prospects. If you wish to study Commerce or business then have a look at Melbourne & ANU & USyd & UNSW & UQ & Monash due to their longstanding reputation in terms of business school.

Good luck with your search and feel free to PM me if you have any questions. I graduated from UQ last year in Economics and now I'm going to further my study in postgraduate level at LSE in the UK ^_^