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 (Efi Live, 450hp
1972 Toyota FJ40 4" lift, FJ60 axles, FJ60 4speed with split case, 35's, Detroit locker rear, Lockright front, Marlin Highsteer, 105"WB, Saginaw with GM tilt column, soon to have: 30spline longfields, inners/outters, toybox.
1967 Porsche 912(100% stock)