I have just learned that the Department of Education in Western Australia has a very good education for gifted and talented high school students. Perth Modern School is a fully selective academic school with a brilliant music program and there are also schools like Shenton, Rossmoyne, Churchlands, Willetton - all are top performing in the state education tables and all do as well as if not better than most private schools. Why pay $20 000 when a few hundred dollars get you something as good.
To get in the the Year 8 2009 Gifted program you actullay have to apply by Feb 22 2008 - otherwise it is really hard and a lot of paperwork. The best thing is that the Education Department will pay to test your child anywhere in the world - as long as you show that you will be in WA for the start of the 2009 school year. If your child is entering Year 9, 10 or 11 I noticed that you could register for testing for these years in June 2008.
Their website is
Gifted and Talented - I have already filled out my online application and registered my older son. Thought I should pass on this news as the window is really short (I think they get thousands of applications) for about a 1000 places in the program - which includes academic schools, music schools, drama schools etc.