Fords 6.0 and to a lesser extent the 6.4 made a lot of die hard blue oval guys into Cummins or Dmax owners. The really die hard Ford guys with lots of cash even paid places like Destroked to repower their Fords with Cummins power. The biggest thing you need to think about is the cost per mile to operate, the total number of miles the vehicle will have when sold, and the resale value. Don't let the short term saving cost you dearly in the long run. The day that gasser rolls off the Ford lot it's going to be worth $10,000 less.