Well I have the AVIC-Z2.
While I dont know what the differences between the D3 and the Z2 are except for the hard drive, I can tell you from personal experience that I see absolutely NO point for the 30gb hard drive if you have an iPod. If that is the only difference between the 2 models, then I would get the D3.... especially for the cost savings.
I do like my unit, BUT if GM would just do like Acura and many others, and just make a GOOD factory nav unit with touchscreen and bluetooth, then maybe we wouldn't have to change units anyways.
Kinda funny that a $70,000.00 vehicle gets beaten in technology by your standard issue $20,000.00 Japanese import.
