Garmin streetpilot c310
You can get it for under £300
It got me from the center of london to somewhere deep in the fells of cumbria without blinking an eye. I made several wrong turns due to traffic and not being in the right lane ( although it did tell me s " stay right/ left etc " ) and it just says " recalculating" and gives you an alternative route.
The alternative is tomtom 300, they are both similarly priced.
It has night mode for the screen and easily adjustable sound when tou want to shut it up cos you know where you are.
Couldn't be simpler to use straight from the box. Stick it on your windscreen and so long as it can see the sky it aquires a satelite and pinpoints your position to 10metres.
I was a skeptic at first but this thing inspires great confidence to jump in the car and explore . Also you can download speed camera locations free and add favourite addresses to the menue.
I didn't trust it at first but one of the reasuring things about the 310 is that you can see all the different street names comming up and check it's not having a laugh.
I got mine for the north meet and got my money back when i came back as i couldn't justify the £300 but i believe amazon do them for £270 ish. Yes i own Amazon .com

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I would reccomend getting the hard plastic case so you don't damadge it when you take it out of the car as it's not the sort of thing you want to leave lying around.
I don't think it's much good for navigating on foot though, it is realy just an incar thing, same as tomtom realy except i heard Garmin started them first. Funny what branding will do for a product eh?
