I paid $1800 for my Southern Belle 1985 300D. When she got hit the agreement with the insurance company (of the other driver who was responsible) was for me to keep the car and pay me $4400. When your insurance is covering the payout will be low end of market value. (Been there done that) Since your rear end damage was caused by another person you should get a good settlement. I am sure that her insurance company is pretty pissed off. Her insurance rates just became the price of a small home mortgage for the next 5-7 years. If you surrender the car I would not settle for any less than $14000. If you keep the car I would not settle for any less than $11,000.