After much input from everyone here, I purchased the TomTom GO910 for my partner for Christmas.
I tell you... he loves it. It has US, Canada and Europe maps all loaded. It does not use memory cards... has 20 meg of memory... and the maps and software use about 4 of that. He has also downloaded all his IPOD music onto it... and uses his cellphone via bluetooth with it.
One great feature is that it tells you the name of the street you should turn on... not just "TURN LEFT" or "TURN RIGHT".
I highly recommend this one... I also bought it from Abe's with a $100 rebate.
William