I have had a few GPSs for the lanes, my current choice is the Garmin 62st you can use the OS mapping on it which is great if your route is a little unclear on which way to go, it is button rather than touch screen, I have avoided touch screen due to having muddy/gritty gloves scratching the screen.
The street pilot 3 is slow at calculating, quite large and heavy for off roading and doesn't support OS mapping or the latest NT mapping as non-NT updates are being phased out by Garmin, it should be very cheap to buy as they are dated now so if it was damaged nothing major lost.
If your on a budget try and find an Garmin Vista/legend HCx or even a 60 Csx, these don't support OS mapping but do support NT mapping they are very reliable, waterproof and will withstand knocks and shocks.
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