You buying a Garmin Zumo...............Ye Gods!!!! You'll be buying a cell phone next!!!!
I have a Garmin Zumo 550 on my R3, mounted to the back of my windshield above the gauges (I can still easily get the ignition key in/out) Let me know when your schedule permits when we can get together and you can check it out.
I got it just before Christmas for $636, I found Amazon to be the cheapest.
ATB
Tony
PS The handlebar wiring clamps you sent me last week are the dogs bollocks (F.Y.I. thats a quaint English term for excellent). I wish all vendors were like you