I would have 2 trucks. 1 with the 6.9/7.3, and the other with the cummins.
This truck I have is my first diesel rig, and I love it. No, it's not fast, it's a pickup truck. For my purposes, the 6.9 is plenty good.
Ultimately, I would like to build a early 60s Dodge 3/4 ton with a Cummins...