I havent seen a nice black/black 06 anywhere for under $20k. Believe me, I looked hard all across the country for 6 months. Even with 120k they are not cheap! I almost bought one a few months back with 74k on it for $24k but it fell through. If its nice and clean the retail on it is $22,500. That is what the bank will finance on it. You will have no problem getting $18k or more for it. They dont last long at that price. Dont plan on using it as a trade. The bastards wont offer much but they'll put it on the lot for double!
Good luck