Larry,
My workmate from Indy uses a Tom Tom One on his Ultra Glide and seems very happy with it. I have one and it's small enough to pocket if it starts raining. They're pretty affordable, not too many bells and whistles and they work very well.
Keith,
You're probably looking at a very different beast if you want to run thru the woods, probably have to load specific maps into a hiking unit designed for the beaten path use.
