Mounting and wiring a GPS
Just another opinion for you to consider. I have a Garmin Zumo 665 which I feel is the best available motorcycle GPS. I have it mounted on the right handlebar with a Ram mount and it is wired to the acc side of the fuse panel. Regardless of which handlebar you mount it on you can operate the touch screen with the fingers of either hand. Reaching across with my left hand is actually very natural. I prefer the right side because visually the shoulder side of the road is usually less busy so the GPS is out of my normal line of sight and less distracting when I am not looking at it. I have mine wired to the acc side because I prefer for it to come on when I start the bike and to shut off when I shut off the bike. I don't like having to remember to switch it on or off These are just my personal preferences but it all works for me. One last thought I have been using Microsoft Streets and Trips for my routing and I like working with it better than any other of the software's currently available.
Good luck with whatever you decide on