I'm wanting a diesel for the durability and longevity.F250/350 is going to be a tight fit with 3 people for any long drives. Are you just wanting a diesel for a diesel? If you aren’t towing often I’d just get a gas rig (Currently own a 7.3 myself). If you’re wanting a diesel or a diesel then get whatever will make you happy. 7.3s are great but slow, even with a a tuner, they also are all getting up in age and will need maintenance and low mileage ones are going for over 20k currently.