Depends on the time frame, but over the short to mid term (now - 5 years) I'd have to go with Sydney, Brisbane and Perth in that order. Although I think this next decade belongs to units more so than houses in the 2-10km radius at least. I'm certainly not as bullish as Mr Edwards at Residex though with my CG forecasts though and think immediate cash flow is more important than ever.
With interest rates dropping and sentiment still subdued theres a lot of similarities with mid '08 and opportunities all around.