The only complaint I have about a 4BT is noise... You are going to be wanting to wear earplugs anytime your driving it. not to mention is vibrates everything. Been on the trails with a guy who has one in his buggy and it is loud. he shuts it off as much as he can to avoid noise.
I would go with the mercedes diesel like jeff mentioned...
2005 Silverado 2500hd Duramax
1972 Toyota FJ40
1967 Porsche 912(100% stock)