I have been reading the board here for a week or so and have found out about being able to upgrade to an OEM Navigation unit, and also the LUX amp upgrade. Are there any other parts from the Escalade or Denali that are nicer or better looking that can be used on the interior of a 06 2500 cc? Thanks in advance!

Yes, the Denali dash bezel and inside door handles are direct replacements for the 2500 parts. Since you have a crew cab, the switch plates that also have the Denali "wood" are also available. I have an extended cab and since the Denali Yukons were the late body style with the wood switch plates, there isn't a match to the drivers side switch panel. As far as a steering wheel goes, I had the leather wrapped normal GMC wheel and purchased a Denali radio control wheel from American Stitches (along with the harness and radio switches from the GM dealer). E-mail me off-line and I can get you the part number for the dash bezel and the two front inside door pulls. As far as the exterior goes, the Escalade door handles and the Denali pickup truck rear tailgate latch surround and pull are available (you paint to match). All of my parts are ready for installation as the dealer just received the last radio control switch in today.