if your after cheap "RELIABLE" sat nav, look no further than the Tom Tom series. any of them..... we have sold more than 3000 since xmas and can honestly say we havent had a single one back.... unlike garmin, which seam to freeze on people, medion that are just rubish, Mio, waaaay too complicated, navman....er.......never ever get a signal.
depends what your after tho..
the newest ones, the 310 510 710 and 910 all have bigger screens than the older models and are much faster. they have blue tooth for your phone as a hands free kit and have live traffic and weather reports. the 910 even has a built in mp3 player..
the tomtom one is still the best selling navigator on the market tho, and for good reason too. its reciever can pick up a signal in a submarine if you wanted it too. they never fail, theyre small and portable. theyre realatively cheap... (£249 ish) and have every address in GB, also they all include free traffic cameras as standard with no subscription......bargain
anything you want to know about sat nav i am an industry expert on the things....lol