I agree with what has been said about OFSTED reports; a visit is vital and you then go with the atmosphere in the school, do you like the head etc.
However, I have in the past removed my older children from a school I felt was truly terrible - a few months later it went into special measures. There is an atmosphere within a school when it is going down; it's important not to ignore your instincts.
My younger children are in a school that over the past twelve months has had a very bad atmosphere and the sense the head had given up. This previously "good" school achieved a level three OFSTED and one of the governors said they were very lucky to avoid special measures.
In the same way, you can sense a school on the "up".There is now a new head and a more positive vibe within the school again.
I guess I am trying to say that although OFSTED is just a snap shot, they are pretty good at pickingup on what the parents already know.
Outstanding schools are not necessarily the right one for your children, sometimes they are so focussed on results, they are lacking in the pastoral care department and can be somewhat cold and clinical.
My youngest daughter was at an outstanding primary school and said these were the happiest days of her life, filled with good memories. My eldest daughter absolutely hated it, found it to strict and formal and did not flourish.
Just a couple of different perspectives here.