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Having to remove the Nav disk to play DVD or Audio CD IS just GAY. Therefore, the 2 disk system would win in comparison everytime. It amazes me that any company would even make a one disk system when the NAV info needs a drive.
A lot more money, but what about the AVIC-Z1 unit. It has one drive but it's free as the NAV info is stored on hard disk, which is also available for ripping music onto.