Originally Posted by Sauveur
I would pass on the enhanced bluetooth. You dont want to use blue tooth for audio anyway.
I would not pass on the enhanced bluetooth (option 6NK) - especially if you plan on using an iPod as a source. With 6NK you get a digital signal* from the iPod to your head unit and this is how you want it (IMO) if you want to make the most out of your sound system with an iPod. With 6NK you also get voice control, cover art + the ability to have two phones (your's + your significant other's) connected at the same time. And the option is cheap.
*EDIT: The digital signal is via USB and this should be the best option for sound quality. Bluetooth streaming that also comes with 6NK can be convenient, but the sound quality suffers.