I have 2 American Paint Horses at the moment, although I have had 3 Quarter Horses prior to this - they lived all their lives with me. The Paint horses are basically Quarter Horses with colour.
They are a fantastic breed - kind, gentle and very intelligent. My horses are all ridden Western and I have never had a back or leg problem, I'm not sure where that comes from?

Make sure she comes from good stock, there are not many good Stallions in the UK so they tend to get heavily used. Check also that her feet aren't very small - some breeders like them like this but you may breed something that will pay for that later on!
They also mature quite late, so please don't breed from her too young.
Good luck!