from PM;
its simple; what do you want to learn?

To be honest, Usyd and RMIT are very different in many aspects: tuition fees, entry requirement, reputation, location etc, hence I don't think there is any difficulty in making a decision between those two. No offense here, but in my opinion, if you are able to meet the requirement for Usyd, you should also be considering on Unis such as UNSW, UMelb, Monash etc.

@hihihehe:
It's definitely not late to submit your application in October as bulk of the applicants will only submit theirs after Christmas when the results for SAM, Ausmat are out.