I think the cost difference is a red herring that trips people up all the time. The diesel is more $$ up front, probably a little less to own or maybe about the same when you balance better MPGs versus a little more maintenance and (sometimes) more expensive fuel, and it's worth more when you're done. Considering all the money you'll spend on the truck, fuel, maintenance, insurance, etc. over the years you own it, if there is a expense difference between the two it's probably too small to matter in the overall scheme of things.
Maybe my truck will be less reliable than the Hemi version, or maybe it won't. I'm not sure there's a way to know that on the front end. I do know that the Cummins smokes the Hemi from a performance standpoint. I also just enjoy driving it more, and that's worth something too.