I am about to buy a NEW TRUCK need help!

Comes down to personal preference. I am a Chevy/ GMC guy so I wouldn't recommend Ford or Dodge, but they do make great diesel engines. Look at all of them. Find the one you like the best. Get the invoice price of that vehicle. Go to the dealership and get as close if not lower than the invoice price as you can get. Don't take no for an answer even if you have to walk out. You want the truck you want with the price you want. It is negotiable. The truck aint going anywhere so take your time.