Congrats on the new ride! I'm sure you'll enjoy it!
I can't comment on the Conti's because my 07 Limited came with the Crapellis on it. Like KW, mine were junk after 20k. I had 18s on it stock but moved up to a Black Rhino 20" wheel with Cooper Zeon LTZs. If you have the 20s on your truck, take a hard look at the Zeons. They are fantastic tires.
My headphones were missing when I bought mine also and I just went with a cheap wired splitter and wired headphones for the kiddoes. We don't use the rear DVD all that much right now so I didn't bother trying to find the headphones that accompany the stock system.