Tom, for my money, I have a Zumo 550. If I were going into the GPS market again, I'd get the same exact one. Many like the hard drive based units, but, I like the reliability of the solid state, no moving parts, water proof Zumo.

It comes with a motorcycle mount, and a car mount. Both stay in their respective vehicles, and the gps comes out with a flip of a latch. Very easy!
Terry