I would choose to live anywhere between Manly/Seaforth and North Curl Curl. Most of the primary schools are very good as is the transport into the CBD. A lot of expats live here, you'll find the majority of them very friendly and always happy to stop for a chat. If you're moving to Oz you have to live by the beach and this area of Sydney is beautiful, it might be expensive in terms or real estate but it's worth it!