I probably will buy a Nuvi to see if it's any good, however I have really taken a like to my
Lamicall Air Vent phone holder.
I initially thought that air vent phone holders were a gimmick, but the S40 air vents are absolutely perfectly positioned to use a mobile phone as a satnav in an air vent holder.
Best thing is the phone does not intrude into the windscreen visibility area whatsoever, and the natural angle of the dashboard means its very easy to see the screen.