First, can I add my 2p worth to the Landrover debate - I have had 5 range rovers and only had one problem. (that was a clutch stuck open - led to the extremely unusual sight of my normally reliable landy being towed home by my, er, reliable TVR....). However, they used to be great value, having fantastic depreciation till around 18k - or 3 years - at which point they were cheap. Not now, however, too many footy players keeping the second hand values high

Also - as I discovered after buying a portable nav for my last rangey - the nav will not work through the heated front screen !
The tomtom range does get a good name, and the newer ones are quite reasonably sized - however having found a car with even better depreciation than a Rangey, I don't need one - its fitted in the BMW 745i. BTW - TMC - yes, you need a TMC disk in the car, but I found on a recent trip to Europe that I had to scan the radio stations to allow the TMC to re-find a TMC channel on the way over, and on the way back (just choose Classic FM for a minute and it should be sorted.) As for paying another 165 quid just to get the use out of what was probably a 3 or 4 grand option - there is another way. Not that I would ever suggest joining Easynews and downloading the disks illegally - that would be very very bad. But good value for 10 dollars a month....
Just Say No kids!