Thanks mikef. It's a gift so don't really wanna buy a second-hand one.
That 310 looks awfully tempting but I'm wondering how it compares to the Tom Tom One?
The 300 range is also good but has been discontinued by Garmin. I currently own a 310, 200 and 710 and personally prefer the 200 over the 310. The major advantage of the 310 is the ability to link using bluetooth with your cellphone to act as a handsfree unit.