Gps Sale What Experience Have You Had With Any One Of The Portable GPS Offered For Sale?Your Recommendation If Any?

What experience have you had with any one of the portable GPS offered for sale?Your Recommendation if any? - gps sale

I refer to "Garman, Tom Tom, etc.
Can you tell where you to find the best buy?
Optional Equiptment What in your case, you would find useful.
Most seem to come with preloaded maps of the United States and Canada. If I wanted to add to Mexico, for example, maps of Canada-package would be done?