Sell it to Carmax. Yes, you will occasionally find someone on Craigslist who can pay that kind of money in cash, but looking at how many people finance car loans should tell you that they are few and far between. I listed a truck with a KBB of $9,700 for $9k, left it up for two weeks, and had only flakes and scam artists. Carmax offered $7k, which was a fair price, although they then turned around and listed it for $11,500 since they can finance the loan.
Lesson learned-Craigslist is a great place to buy a car, but hard place to sell one that isn't a beater in the less than $5,000 range.