What's the best AVIC double din NAV? I have the D3 right now. I know the X920BT is coming out and there is a Z110BT that is the top of the line. I don't car about the iphone like gui, but the Pandora app seems cool. Could I just use this on my phone and send it to either via A2DP Bluetooth?

Yes, you can use Pandora from your phone over A2DP. However , if you want to use the Pandora interface on the new units you have to be plugged in from the iPod cable.