I'm updating the 6's head unit to an ssv one. I am curious though, for those of you with an iPod touch- do you have any neat brackets or mounts to hold it, or just chuck it in the centre console? It's not the most brilliant stereo set up, is it. :/
I'm currently in the process of doing the same thing. As I already bought the head unit and I have an iPhone 4, what I've come up with is getting an Genuine Apple Composite cable which will run from the RCA in cable adaptor behind the head unit, under the center console and in through a little hole in the bottom of the center console storage. Then I'll just run a slimline cigarette lighter charger from the socket in the center console to an iPhone dock in the center console storage.
Then in order to control the music without touching the phone, I'll modify the Apple universal dock that comes with an infrared remote so that the sensor is on the end of a 1 meter cable that runs under the center console and sits just under the head unit. That way I just open the center console storage, dock my iPhone and control it with the remote which allows me to adjust volume on the iPhone, play/pause and previous/next song. Also I'll still be able to control the head unit volume via the steering wheel controls.
The added bonus with this is that with a jailbroken iPhone/iPod Touch, you can see the iPod apps album art etc...