New Hummer Owner from South Jersey Intro

[RichardS]

Hi Guys and Ladies,
I own an '06 H2 Pacific Blue SUV and my son has an '06 H3 in Victory Red.
I'd be interested in buying goodies for each truck that we don't already have, so I'll check here a lot!
In the meantime, I am really anxious to add a back-up camera system to my H2, which does have the touch screen NAV. Maybe back-up sensors too.
Any advice from the experts?
I've read about everything from $99 kits with a license plate mounted cam with a tiny little screen up front to an interface unit that attaches to the GM Nav unit and you buy whatever cam you want. (I like the color matched one that replaces the 3rd light up top in the rear.)
Anybody have any experience with this stuff? No way I can install it myself, so wondering about suggestions in that regards as well. I'm in south jersey.
Thanks in advance everybody!

PS: I also need the 2009 update Nav DVD for both vehicles....I'd be more than happy to pay a fair price for even a burned copy, if anybody's willing!