[Canuck]

I have been using GPS and mapping for over 10 years. I currently have A Garmin Nuvi 5000 which has the 7 inch screen. It has a lot of features. Previously had several Magellens, all were good. Latest purchase(April 2008) based on the fact that Garmin are quicker to update their mapping from Navteq,the main issuer of mapping software. I have not used voice command,but find the touch screen great on all models.I just bought a lifetime software upgrade for $99.00.
Also have a TomTom, they use their own software and their touch screen and memory are great.
I find with all units,address selection can sometimes be tricky,say you are looking for an address that is a suburb,you have to know what the suburb name is to find that address.
Garmin has a nice trip computer application that looks like a dashboard,cool features. Garmin also posts speed limits in the left hand corner of the screen,amazing how accurate it is. Select a model with an SD card reader. It allows you to enter your own data(address book) and download additional mapping.Some states have laws now banning you from mounting a device to your windshield (California),Choose your mounting device carefully.

Paul