When it comes to GPS use the one you know how to use. I have a Zumo 450 but I got a super deal on it and I had a Gift Certificate...and I am still learning how to use it. When I did the trail from TN to Utah in 2005 I had a Garmin GPS Map 76...and I really only needed to use it 1 time in Colorado when I got lost in a series of rapidly branching roads. The GPS is nice but not necesary if you use the roll chart and get used to it. I suggest that you still take your roll charts in case your GPS should break, die, suffer issues etc. The RAM mounts seem to work well and there are many people logging 1000's of miles with them and having no issues. I bought an Enduro Engineering cross bar mount to go with a Touratech mount for the Zumo...works very well.