just purchased an 02 plate impreza sti wih prodrive £9500 . thing is its done 99000 miles comes with full service history and drives like new cosmeticaly sound the usual stone chips and one scuffed wheel .to my way of thinking if the engine packed up tommorow i could go to scoobyclinic and have the big rebuild £4500 .which gives you £14000 would this be the average cost for a low mileage 02 plate .