I've been using a 7" one of these cheap (32 quid) Chinese jobs, seem to have many more features than previous expensive satnavs. They are cheap, both in cost and quality and I know lots of folks who moan that theirs have packed up after a couple of years use BUT I reckon that still works out a good buy. Buy cheap, bin it after a few years and buy latest technology cheap again. Mine came with free updates for life too, whatever 'life' means.
Chris