Hey, just clarifying here.
I got the canadian version comfortline. I got it with no options at all, though in canada that does come stock (tdi package) with the chrome trim (inside and out) fogs, inline circ heater (not a block heater), heated seats mirrors and spray nozzles. To get nav you'd have to upgrade to the highline. And for the comfortline the premium radio is $1300 and all that adds to the package is ipod MDI/6 disc changer, touchscreen, steering wheel controls, sirius, and bluetooth. On top of what the premium radio comes with stock, my deck has SD memory slot, bluetooth music, HD radio, sirius radio, Divx playback, DVD playback, hands free voice recognition (nav, music, and phone), 3D navigation display, AVIC feed (find desired location on my iphone and it shows up on the nav), back up camera ready, and dolby digital playback. Love it.
I don't know the part number for the CAN-BUS module, they phoned me mid-install and said they needed to use it and they had it in stock so I just said sure. The way they explained it to me was without the module it was like having a chain of christmas lights with a missing bulb, it all is tied together and its required for functionality of the speakers themselves. They said it was built in to the stock radio and that's why it was needed as an addition to the install because it comes out with the stock radio. The wiring harness I got at visions and was only 60-some dollars.
No check engine light though, (thank god) it all works seamlessly. Some aftermarket head units say they need an accesory position on the key slot to be installed. I was a bit worried when I went in for install but apparently as soon as you put the key in (I do not have kessy, just the plain old key) it's in accesory mode so no worries there.
I also got my subs put in (2-10" JL audio subs, 300RMS watt JL audio amp) and they sound awesome! no rattles or shaking at all, I was very suprised as they are loouudd. I had to put sound mat in my beemer and it still didn't sound as good as it does in this car.
The only thing I would maybe like is the steering wheel controls, but I'm not that lazy, I can deal with lifting my arm to change the song/volume
.