Just updated the head unit in my Z and I absolutely love it. I went with the Pioneer AVH-P4300DVD, because IMO you get a lot for your money. It looks great and you can adjust the color of the buttons of the head unit to match the color of the stock lights perfectly. Let me know what you guys think.
Auxillary input and USB input in glove box... I hate wires and I think this looks really clean.
Rearview Camera View
Rear view camera mounted with right side license plate light... hidden
Here you can see the rear view camera.