I don't like on the ones that rely on your wifi, I still have the grandfathered unlimited data plans on both my smartphones from VZW. So if I were to add hotspot to my plans to make these work correctly I will have to change my plan & will loose my grandfathered setup. I would like to find one that does what I will list below while able to access the internet via it's own WIFI or able to tether to my droids via BT, the 2nd would be ideal.

Also I have been thinking about a replacement for mine.
Some of the really would likes is it to work with the existing backup camera & steering wheel controls along with the mic in the rearview mirror.
Min requirement would be;
Touchscreen
Nav
DVD
BT
Have to be able to integrate a drop down screen for the back seat & not via rf wireless.
HD Radio
Never really uses Sat or Sirius radio so that part really doesn't matter.