We had the same thoughts when we came accross and we had a list of government secondary schools that we wanted to live in the catchment area of - our personal list was - Shenton College (naturally), Churchlands, Carine, Duncraig and Woodvale. We found that rentals in Shenton College and Churchland areas were very expensive if you wanted a 4x2 with a pool. We managed to find a rental in Sorrento which is a very nice suburb and catchment area of Duncraig - we have been very pleased with them upto now.
Burns beach is a very nice area! You could consider going private (much cheaper than UK private schooling), if thats where you wanted to live. It is very hard and always difficult to know where your children will settle. When we are ready to buy it is unlikely we will be buying in Sorrento due to the prices of the area, so will be going further out, but will still be travelling from where we buy in the future to keep him at the same school.
Hope that helps :-)