I've got a Kenwood DNX-7200 fitted.
http://www.kenwood-electronics.co.uk...n_one/DNX7200/
Quality - superb
Value for money - second hand great, but these were over £1100 new
After sales service - never needed it with this one, but always had 1st class service from Kenwood repair centres
I've added on the Bluetooth phone module, the Garmin TMC, DAB radio and iPod/iPhone lead. I've a reversing camera to fit and then I'm done. Considered the DVB TV but I'll never use it.
The headunit was under £300 off ebay and with the add-ons, it currently stands me at just over £400.
Well worth the money in my opinion.