I've owned two Cummins diesels, back when they were good engines, ... a 24 valve in a '98 and also in an '02. It was not a good engine for offroad use due to weight, if you ask me, so not the best choice for a Power Wagon even if it were available as an option. Diesel emissions are also going through a tough time right now. The regulations on emissions have been cranked down by the EPA and the manufacturers have not figured out a good way to comply with the new regulations yet, kind of like gas emission control systems were in the 1970s. The 6.7 Cummins is plagued with problems, as are the other diesel engines. I suspect it will take a few more years for the manufacturers to get this all sorted out. Right now is not the time to be buying a diesel.
It is interesting to me that the opinions have been essentially 100% in favor of the Power Wagon, instead of the Raptor. I would have thought the Raptor would have been a more popular choice than it is. It is notable though, that the Raptor is the first Ford SVT vehicle that is in the red. This is partly because of the economy, but partly because of dealer greed. Ford priced the 5.4 powered Raptor very good, at $39K, but dealers are adding a $15K surcharge on their lots, and asking $54K for them. And they wonder why they are not selling
MOPWR2U