Thanks for the info SMcK23. Sounds like you maybe had a crummy dealer who didn't know what they were doing.
The more I think about it, the more I think a portable unit will fit my needs. Easier to update. Easier to replace. Cheaper to install. More options when it comes to the storage area.
Now to decide on which unit. I like the Navigon's UI but don't want to buy a crappy unit just because it's pretty. Trying to find decent reviews of various units is hard. CNet's are all pretty old.