Thanks for the information. I'd advise the following to some folks. In 2006 I bought a Garmin with more bells and whistles, color screens, etc. It cost 1/3rd the price of a decked out Silvertip. This is typical behavior for me unfortunately. The thing was so decked out I didn't master use of it.
Unless you are a committed manual reader, have friends who can moderate your learning curve, or are just a gifted techno-wizard, I'd get a top brand, great battery, with few bells and whistles. Get me there and back without reruns of Andy Griffith.