DD,
Why buy a new truck, especially if you're considering a diesel. Unless you're willing to have it be worth 10-15k less than you paid the moment you drive off the lot. I could be off since there's a so called limited inventory.
Consider a second generation Dodge Ram Diesel, 94-02, if you can locate one. They're going for anywhere from 13-19k, depending on how they're equipped and condition. I belong to a Dodge Diesel only forum, The Turbo Diesel Register, and just checked the classified section. Example: 2000, 2500, 2wd, 5spd, with only 158k miles, quad cab, 8' bed, well cared for, garaged and the asking is 17k.
These Cummins engines run forever, with regular maintenance and care there's plenty of these old gals out there with well over 500k on them running strong. I got mine in 5/01 with 75k on it, presently @ 258k and never had any engine problems. It's going to be with me till I am no more.
If you'd like I can pm the info on the one I mentioned. Or, not sure if as a non-member, you can peruse the site's classifieds and check out for yourself. Take a chance and look.
Just my opinion I've had a few other manufacturers trucks and like I said earlier, this one's going no where as long as I'm breathing.