I'm a gps noob, so forgive my ignorance. I've been reading through the posts here, but it's only gotten me so far... I'm looking for gps that can handle rough dual sport use. My understanding is I'll need tracks for offroad, as well as routes for directions on the road. It'll also be used occasionally for xc skiing, car trips, etc. I don't do week + road trips on the motorcycle, so running it off batteries might be ok? (if it's a unit with usb power) Screen size isn't much of an issue, I can live with slowing down to read the thing. So far I'm leaning towards the garmin 62s or 78s. I don't see the 78s on REI's website, and I was leaning towards buying it from them because of the easy returns. Maybe the deals elsewhere are so much better that I should forget about REI though... Anyway, would those units work well for me? Are there other ones I should consider? I don't really want to spend much more than the 62/78s, and cheaper is always better.