I would also recommend a becker. If you like the looks of the one above, then go for one on ebay. The best you can get is the 7820 Traffic Pro High Speed so you get a navi as well. Really easy to fit and it looks even better than the mercedes units. The material is the same as the buttons on the cars.
The navi is awesome as well. Lets put it this way, I liked it so much that I bought two so that I can have one in my car back in Greece as well. The navi puts the mercedes w210 command to shame in terms of functionality.
Another good thing is that people in the UK do not appreciate the functionality of these units. The first one I bought from france came at £260 through ebay.de as they know what they are. I bought the second one in the uk for £142 which is a steal. If you are lucky you can pick one up for £150
