Semester Down Under!

Hi all,

I am looking to be in Oz not this february-june but next year (2012). Cannot for the life of me decide where to go, however. Deciding between Brisbane, Sydney, and Melbourne.
I am an anthropology major and a theatre minor so therefore will be attending university for those things. James Cook, University of Queensland, University of Sydney, Monash.... I can't decide.
I want be be mostly warm(ish) for my time down under. I currently live in Philadelphia, PA and there is so much snow I don't know what to do with myself.
If you all could just offer your opinions and keep in mind that I will be studying and trying to get a full 'experience', that would be lovely.

Thanks!

Monash Uni has a wonderful Theatre department and Melbourne has some amazing theatre and arts groups, regular performances and fantastic local theatre groups to get involved in.... of course the average temperature in Melbourne isn't as warm as Brisbane or Sydney, but it's a lot less humid!