Given the possible work locations for you and your wife, I would highly recommend you exploring HK Eastern Side i.e. Sai Wan Ho (Grand Promenade), Taikoo Shing/Quarry Bay or Tai Hang area (near Causeway Bay).
Sai Kung, honestly speaking if you do not travel by your own car (At least park at Choi Hung/Lam Tin), it is not convenient to your family esp your elder kid will go to the Peak for study.
Once your family lands, if you are looking for a good and trustworthy agent to show you Eastern HK side, you are welcome to PM me.
Wish you have a smooth relocation to HK in August!