I think the big BMW is perfect for the kind of riding you do. Hey, it got these fools around the world so it can't be all bad:
I have the Delorme PN-60w with spot. Every time I'm back from a ride I go on the web site to make sure the tracking function worked, and sure enough, I can pull up a neat little map that shows all my locations at ten minute intervals with little numbers on them. Any rescuer or spouse or whoever can look at this and see where you were going and where you stopped. The being able to send text messages one way is nice too.
I also carry this EPIRB for a backup: