Hey kool he knows the place, don't forget the mid levels and also the Peak, especially if you want the american/pseudo-international school or the German/Swiss school, and of course there is Kowloon, in the pulsing heart of the city or even down the coast towards the old Kai Tak airport...
Forget Sai Kung unless you are willing to a have a car (expect leasing costs of 1100US$ per month minimum) and ride an hour to anywhere. Yes its lovely countryside but schools - ugh!
There is also the Saddle between the north and south of the island - 4 months of the year in the clouds, but a lot cooler and less sticky than down on the beaches and water levels. On the south coast of the island there is Tai Tam near the american club.. nice and calm if you don't need easy access to schools and can take the sea-sick making busses to the rest of the world.
It depends what your family needs and you want and the package can afford....................
Mail me when you have some dates....