House prices are 'good' in Windsor??? Really?
Anyway, if you are willing to consider a village near Reading I'll try to sell you Goring on Thames.
On the railway with good Oxford/Reading/London service, on the Thames, between the hills and woods. Beautiful but convenient.
Really good state schools for primary and secondary (and private too, if that's your bag)
Most people move here with babies and toddlers, often from London. Sometimes they have family links to the area but often not. There is NO sense of being an outsider, but there is a massive sense of community. Once people move here they usually stay. Everyone looks out for every one else.
As well as young families there are many older people who moved here with their families and stayed. Yes, they are quite conservative, but the culture among the younger people definitely isn't.
It's a smallish village - there's always going to be a limit to what's going on compared to a town, but for it's size there is a lot and you are within easy reach of Oxford and London. There are lots of people into music/art/sport and it shows.
Personally I think it is a perfect place for a young family. I've yet to see how it will shape up for teenagers, but the train should help.
It isn't cheap. You'll be at the higher end of your budget for a decent amount of space and you won't get picture postcard pretty. But if you're willing to buy a 60s/70s house that an old person is finally moving out of (for about 450-500) and spend some money extending/improving you'll get something pretty good.