I got a Garmin i3 from Staples for £160. All I really wanted was a camera warner (you can get a free database of speedcam locations/alerts off the web at
http://www.pocketgpsworld.com/garmin...ed-cameras.php ) so the nav bit comes for free. Great little device which you can take with you when you leave the car - highly advisable.
There are lots of great satnav products out there and traffic info is the coming thing. However, the field is rather volatile with new candidates appearing monthly, e.g satnav boxes with an RDS feed from the car radio, mobile phones with TIS as part of your data bundle etc.
Consider carefully which countries you travel as the mapping products are very expensive. Also ponder how big it should be and where to mount it: my Toyota has 9 airbags including the wscreen pillars, so you might get a face full of supersonic Garmin.