Ya the whole reason behind going with the 7.3 was to stay with a ford power train. I know the 4/6bt cummins are popular swaps because they are around 150lbs heavier then my 351 but have much more torque.
Maybe on the next one I'll do a diesel swap but for now I'm just going to go with a gasser. I don't drive the truck hardly so time really isn't much of an issue for now.
The only down side is that with winter moving in and colder temperatures it gets harder to work on the truck since we don't have any kind of garage/pole barn and my buddies are busy fixing there Chevy's for the spring.