I'm a 6.7 owner at the moment, but have owned many 12 valves and a 5.9 common rail.  I have to say that the most fun to drive Cummins I ever drove was a 24v with a NV5600.  It was awesome, but had been an Oregon logging truck so was pretty beat.  I'd bet you could drive around town with 10 gallons of water in the box and not lose a drop!  Too many hard miles with hoe buckets in the back I guess.  Love where your truck is headed!
Off topic but is the "La Providencia" taco truck still there by the feed store on the north side of Tillamook?  They make some of the best pastor tacos I've had north of the Mexican border!