Please get your self a V10 Ford. The Ford 6.0 and the 6.4 are the ones to stay away from unless you like projects and uncertainty. As demonstrated above when things go wrong it can get really expensive.
Go search you tube for PowerStroke Help and just watch the videos he has on the 6.0. This man has literally built a business solving the problems with the 6.0.
I can't find anything quite like him for Duramax or Cummins diesels....especially for a single generation of motor.
V10...thirsty and boring but reliable as a hammer.
Cummins and Duramax diesels (all motors really) have issues too but they are not nearly as significant.
Thanks!
Jeremiah