Keep an eye on Dweb for sale section. I'd say a well built truck comes up every 4 months or so with everything you want. Usually around 4500-6500 but realize the nice interior and whatever you mean by very good condition are going to be subjective. If you want a mint truck with mods you're better off buying a mint truck and modding it.
Do not read the next sentence.
You little rebel, I like you.