I'm looking at a couple of '05 Suburbans, both Z71, but a few differences. One has a touchscreen radio that I've seen, the other has a **** and button setup. What functionality am I losing if I end up buying the one without touchscreen. I'm fine without navigation, but mostly concerned about interaction with the 2nd row screen.

On another note, both of these are nearing 200K. Assuming they've been decently taken care of, how much life should I expect out of them?

Thanks