Check this link out first:
Placed order for a Garmin 665 There's a whole lot of Zumo info on their site too. Highly recommended if you are looking at a GPS. You may have to register to see all the info they have on it.
Might be a bit to early to buy that model yet as it seems to have random shutdown issues. Also, watch who you buy from. If they aren't on Garmin's approved vender's list, you have no warranty.
Mack