i'v just bought a cheap and nasty navigo widescrean from fleabay ,the onboard software is ok but not upgradeable (there is a small one from ebuyer) so i plonked in tomtom 7 which is far better.
i dont drive much but its extra features will mean i can play mp3's ,mp4's and fill a memory card up with photo's to keep the inlaws up to date with our branch of the family