Bought a salvaged 2000 F-350 in 2002, from a guy in my town who had a reputation. I told him I was looking and that the dealer in town told me that he could pick out a salvage truck from a mile away. We were walking across his yard, he stops, turns and says, "I will put any of my rebuilds up against any of his brand new ones, as far as fit and finish goes, he doesn't have a chance." So I bought it, it had 45,000 when I bought it, sold it to my brother at 111,000. The only thing that I ever had to work on was a rear end sensor that went bad. $30 and 15 minutes laying in the parking lot of a dealer in Miles City, MT and gone again. The bro has 145,000 on it now. Best truck I ever owned, wished to hell I would have never sold it.
I agree it has to come from someone reputable, financing was a snap, at least in MT. Resale will not be as bad as you think, at least with that truck, mainly because it was the 7.3. If the 6.4's have a bad reputation, you might take a butt-kicking, but in my case the lines came together and the truck's value was the same as a clean title, after a few years of course.
The old man has a 2002 with 200,000 on it now, regular oil changes and some front end work at around the 200,000 mark. Not bad.