All you guys keen on SatNav, have you considered this unit just released by Garmin http://www.garmin.com/products/quest/ It seems affordable and does most of what an inbuilt one would do but it totally transportable between cars. Comments please
The Garmin unit received a very poor write up in G3. I've seen the TomTomGO in action. Its remarkably accurate and uses a touch screen. I've also seen a Panasonic single din unit with pop-out-and-up touch screen. Again screen clarity and nav accuracy were extremely good.
I can really recommend it as a portable GPS device. It is also very flexible, as I currently have all of the fixed speed/opps sorry safety cameras located on it(which can be downloaded free to update the database), and also the full postcode, 3rd party application, is really very good.
Ofcourse you have the price of the PDA to consider, but as my company gave me one free, that was not a concern for me
tomtom Go or tomtom for PDA brilliant - thoroughly recommended - also seems to rate very highly in most reviews. Very nice interface and well supported software extras. Cheapest price for tomtom Go about ?420 on Amazon, and best thing is you can take it out of the car and walk around with it.
I'm gonna go down the retro fitted MFD2 route as well. I really liked the layout of the dash when the initial pictures came out. Was a nice suprise to hear it could be had for a reasonable price and a bit of elbow grease 
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