i am looking to buy a diesel f250 or a f350 quad cab with a manuel trans within a year. i did own a 7.3 idi and had troubles with it so what im wanting to know is whats the best engine for power and fuel mileage as this will be my daily driver and im looking to buy a camper maybe a 5th wheel and im going to be a new dad and my soon to be wife has 2 kids already so that's what i want to know any help or ideas will help and i may want to to mention that i am wanting to build a house so will need good towing also.