Half of me wanted to get an aftermarket headunit and just be done with it, the other half liked the way the factory one matches the climate control unit, so a decision could not be made.
Lots of people go with a simple FM transmitter, but i dont like the loss of sound quality that results
So browsing one night, i came across this site.... www.worldpress.com/clarion-aux-input
It makes use of the unused C-Net socket on the rear panel and works with the Clarion PF-1572I single DIN, the Clarion PF-2143I double DIN and the McIntosh PF-2142I from the B4

I bought one of these from www.minikits.com.au for $10.25 inc P&H

This is how to wire it (ignore the 10k resistor, it works fine without it)

This is mine, all soldered up

This is the completed plug, with the headphone plug and switch wire

Testing it in the car (notice how ACCS is displayed on the display

Mounting the switch

Completed

Currently using the GPS as an MP3 player, sound quality is as good as the CD player (100 times better than FM)
Now i just have to find a suitable MP3 player that will be easy to use while driving, but i refuse to by anything made by Apple.