I sold on Autotrader too. Both a 2000 Nissan Xterra 4x4 and a 2000 VW Jetta GLS with WAAAAAYYY too many miles. Both times, had the cars around a year, and got what I owed, plus some.

I am going to be selling my wife's 1999 Honda Accord pretty soon, and I plan on using autotrader again. It is a 1999 LX with leather, sunroof, power everything and 53,000 miles. I am looking for 11-12K on it. (shameless plug)