Just seen your post as I am also looking to replace the stock unit with a double din AV head.
I quite like the Kenwood units; Kenwood AV http://kenwoodblog.co.uk/?p=2379
From what I’ve seen there does not seem to be a massive difference between units in terms of user interface. Happy to be challenged on that though!
As I am interested in DAB and the phone connection along with iPhone connectivity.
Not sure if the wires leading to DAB Ariel and phone mic can be tucked away though and don’t fancy them in the cabin.
How have you got on selecting a unit and with the install?