Agree with GR.
A few considerations for that area to be aware of:
1) Southern Florida is a bit of retirement centre, so you are relying on empty-nesters in many parts of the State as your clients - as renters and/or future buyers.
T2) here are also a huge number of holiday makers go there, so many houses/apartments are owned by people who go there and spend time in their holiday property, or rent it out to short-term tenants for a week here or there.
3) I'm not sure how good the long-term tenant market is based on this.
4) Also, as with most of the US, individual properties struggle to get good PM's - most are involved in the apartment side of the market.
5) This area is experiencing a severe hit to the apartment market at the moment due to over-supply, over-price and the whole sub-prime mess.
So, in summary; get ready for an opportunity to make some nice cap gains when the market improves (this could be 5 more years), but be prepared for some very ordinary cashflow and possible difficulty getting a PM, and keep in mind there will be no tax benefits on your Aus income.