Im interested in an S4 spider. I see a 91 sheel white spider out of virginia and a 93 black spider just posted today nov 7. The black one looks like previously advertised and sold for 15k out of Leesgurgh Va Auto Gallery. As I am very new to this Id appreciate any insight on quality mileage shape price etc....and what should one expect to pay for an S4 91-93 roughly THANKS in advance