I have recently bought the Parrot CK3300 GPS hands free kit and although there is a lot of wiring its actually a brilliant system. I have my normal phone and my pda phone (with tom tom) connected and both work at the same time (one with gps and one handsfree) and they can be easily changed / connected / disconected.
I have the DPSM wiring as well so there wires are collecting. Might need your help Sebby when i get my Ice Link next week
Ben