I'll throw out my 2 cents... I've had all three trucks in the past 10 years. The Dodge is nice and the motor will go the distance. But others are right, the rest of the truck doesn't hold up at least for me it didn't. I've owned a shop for the past 22 years and we happen to be next to a shop that does lifts, wheels, tires and etc. etc. and hands down the owner and employees all have the 7.3 Ford. The motor truely is a beast, but the drive train isn't. As for me I have now the Chevy, mainly beacuse of the tranny. Most of the deisels these days will go the distance, but very few have the tranny to go with it. Besides, go test drive a Ford 7.3 and a Chevy and see which one rides better. You'll understand why the Chevy was my choice.
Hope this helps.
Jason