Ok, when this thread appeared, I was still in my expensive GPS mode of going the route of an in car system, complete with DIN sized LCD, etc.

But, I now realise that idea will be quite expensive for the little I will use it in car. So, I'm looking at the Garmin products now to decide on one for car, motorcycle, and possibly portable use. I had an impressive demo of the StreetPilot III thanks to the trip to Dionysus's new apartment at the empeg meet. How does the GPS V compare to the StreetPilot III for navigation? I'm assuming pretty close. Beyond the color screen, and some extra "portable" features on the V (like the sun/moon screen), how do the units differ?

And lastly, battery life. How many batteries would I need to look into if I plan on using one of the above units all day on my motorcycle?