.. to be honest you need to compare like for like and is the S in good condition? can the person you know get you a similar car and offer you more money?
in fact can he give you better money for yours and you go buy the one above?
The bootom line Lou, if you like it then go for it as long as you can afford it
there will always be what-ifs
good luck and the one above looks
the best colour to have by far
