The new Mio Moov M610 might be really cheap, but thanks to simple menus, a handy 3D junction view and lane guidance, it makes it into our top five. The keyword search is useful too, finding our POIs with ease.
However you don't get any traffic notifications, and the speed camera info is only free for three months. Plus, the mount is too fiddly to win any prizes here.
It's a bit slow to re-route, and the postcode finding isn't the best, but the Mio is still a neat little sat-nav for the low price.