You have a PM
For £100 you can't go wrong, don't expect too easy a ride getting it all working though
BT - forget the oem and use whats on the unit, you can get the oem BT working but only advantage is the steering buttons
As for steering controls i.e volume etc give http://www.incartec.co.uk/ a call they are really knowledgable and helpful
I don't know the non Bose setup but i would imagine its slightly easier
Good luck