re: Late model 2011 Tahoe LTZ..

Well then get the best deal on whichever one you choose. I'll say this on the Nav issue: I hate nav systems and the one that comes in Tahoes is old and crappy and not nearly as useful as my phone, BUT not having it also means you don't have a back-up camera (unless you have one in the mirror) and that SUCKS. I went to a stereo store to see about adding one of those Pioneer in-dash dvd players & a back up camera and it came to $1800, when all I want is the camera.