Schooling (Johannesburg)

Hello. I am planning to move to Johannesberg, but I realise that there are very less Cambridge affiliated schools near Sandton area. Can anyone recommend a good school, if I was staying in/around Sandton?

My office will be in Sandton, so I do realise the issue if I were staying outside the area, in order to avoid a long commute. I am wondering how to decide - should I stay near the school, and spend hours getting to office, or would it be wiser to look for a school outside Sandton, since the kids commute will be off peak hours(which I am assuming)?