Hello, went on this holiday in February/March this year and was a great holiday - you will have a marvellous time. Never realised how large Australia is until we had to fly from place to place. Weather varied from very hot on west coast and central stops, to damp and cooler on east coast - although I understand this was unusual. Highlight was scuba diving on Great Barrier Reef, something I always said I would do some day.
Australia is expensive although exchange rate has improved slightly since then. Enjoy!