If you can remove the Kenwood screen that's really great!
I have a SatNav from Becker
http://www.becker.de/beckerCC21/www_roo ... anguage=En
which is the same as the Sony, etc. SatNavs without screen (they all use Becker and just "wrap" it in their one case...
The good thing with the Becker version is that you can order it in blue/red (blue display, red buttons)!
I thought about buying the MFD instead, but I already got my old Snoy stereo stolen, and with the MFD you can't remove anything like e.g. a frontplate, so there's not much you can do to make the MFD uninteresting for thieves... I know that one guy in Germany from polo9n.com got his stolen the same week he bought it....
You can always connect a mp3 player to the AUX-IN and although according to VW you can not fit the additional TV-Tuner into a Polo it's working in reality... You can also get an extra box to get TMC (traffic jam announcements included in your route calculations) but the only radio station here to send the TMC signal is Classic FM and the coverage for the UK is not as good as TMC in other countries.... (I wish Radio1 would send TMC signals)