I like the idea that when you start up the car that it continue to play the last song that you were listening to. However I would like it if the volume faded to the volume that you were last listening to the music at. So that it isnt a shock when you get in. I know that this happens with some stock radios (my wifes honda does it).
I also want like the standard things like GPS, OBDII, etc...you know like what the windows people have.