These things vary way to much from area to area, especially today!! Two years ago PSD's were selling way over KBB and now they can't give them away!!
You're best bet is to compare it to what others are asking in your area. Doesn't matter what they are selling for where I live, you aren't going to come here to buy a truck, are you? Good luck, it is a buyers market, I would shoot low as most are desperate to sell. I am keeping mine even if diesel hits $10 per gallon, I just won't drive her, lol!!!
NCH