Our 12 year old Grand Espace needs replacing after 215,000 miles. We have to seat three 6' sons in the back so leg room and comfortable proper adult sized seats are essential (the fights over who has the middle "seat" are unbearable in a normal car!). We like a high driving position and are looking at getting another MPV style car again. Which is the best and most economical to drive on a £7k budget?