Any version with firmware of 1100 or above will take the camera
Try and get a C if at all possible as that is the latest hardware and will run the latest/future firmware
Steer clear of A's as it looks like they won't be able to use the new firmware 2700 when it comes out
Its looking likely that VW will be stopping their firmware updates for A & B at 1200 where as the C starts at 2660 onwards, although its not clear what the official support for B units will be, there may be restrictions depending on the hardware level of the B
Voice control only works on firmware 2660 or above
And try and get one with a physical key code card, some of the ones without the keycode have had their insides messed around with to read the codes, and that can cause problems with firmware upgrades turning your expensive navi into a brick
