With a Maestro RR you can install anything you want and still maintain all factory functionality. It is an added expense above the cost of the head unit but as the old saying goes, "Buy once, Cry once". In the grand scheme of things it really isn't that much extra expense to keep everything working.
*** EDIT ***
It is funny, I just posted this and then when looking in the for sale section seen this...
This has been sitting on the shelf since I sold my suburban. 100 bucks plus shipping? It is the ONLY kit that works perfectly with the Bose systems...and if you're here, you already know.
www.tahoeyukonforum.com
I have no affiliation with the seller, just thought it was funny. Also a decent price in my opinion.