Fred Swanson as recommened in the previous post is a great guy and does excellent work. He installed my DTT trans goodies and DD stage 2 injectors 40,000 miles ago and all without a hickup... Call Fred before you do anything to your truck and tell him what you want out of it. He will hook you up.
One other thing, his prices can't be beat!
Enjoy your new truck! I just ordered an '05 3500 dually quad cab... I can't wait!