Most all of the mirrors like this have additional inputs. Lisa and I tested a mirror/camera setup that even had a tv tuner build into it! I personally run a Panasonic CO-VAD7300U 7" screen that has FM/TV/CD/DVD/MP3 built in and is Sirius / Nvigation ready. AVIC-1s have dropped to around $1400 now and offer some gauge functions and built in Navv but I don't think TV.

Will post when new mirror/camera setup is in.