I am going to add the hitch as well. My bumper is M-sport so I will be getting the new lower center plastic piece that removes the reflectors.
I also need a snowboard and bike rack. I will be getting the Thule or OEM version. I need the back seat for our new one on the way and I want the dirt on the outside of the truck.
We don't have OEM Nav, but I wouldn't spend the time or money to put it in. The Garmin Zumo that I have (waterproof and works on my motorcycle too) fits into the compartment in the dash.
We have Sirius and only use the iPod through the AUX input as we don't use it that much. I wouldn't spend the cash for the DICE, but that is only because hardly ever use the iPod. If I did, I would use the DICE.
...and BTW, this thread is useless without pix, so here is mine