Hey Rick.. Only a few EcoDiesels that I'm aware of that are over the 150K mile mark. At this point I think it's just to early to tell how reliable these motors are long term.
Just my opinion. Welcome to the site!
I've figured out once you find a good body shop you should just probably stick with them. That's what I done and don't regret it. I've heard many horror stories around body shops and how they "fix" things.
Welcome Arnold! I can't steer you either way but it should like an EcoDiesel would fit your needs perfectly. There are some horror stories out there but for the most part everyone loves there's EcoDiesels.