You should also check out Sai Kung. Lots of expats there too. Lots of socail life in Xtreme, Steamers, etc. And easy to commute to Shatin through Ma On Shan. (There are regular buses or you could get a car - pricey to run but convenient.) There are 2 ESF schools in that area - Sha Tin which might be better for you - or Clearwater Bay (where my son goes).
Lesley
Sai Kung