Ive lived in Sydney, Brisbane and Adelaide. Brisbane is best for weather but I didnt like the city itself, a purely personal opinion though.
Sydney is great fun, multicultural, great lifestyle but expesive.
Adelaide is a nice city. A bit cooler in the winter but the summers are red hot. I dont know how old you are but Id say if you are a bit older or prefer the good things in life, like nice wine, geat food etc then Adelaide is a good place.
I havnt been to Perth, but I have heard very good things about it. You may feel a little isolated though. 2 days by train to the next city (Adelaide).
Some of the places on the Sunshune Coast north of Brisbane are great. Noosa would be top of my list I think if I head back down under.
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