Here's another cool gps mount idea from Ram Mount. Just a simple threaded ball. Pop off the mirror plug by the clutch side lever and you can now put the ball in. Very clean and cheap too.
You can put one on the brake side also. The levers have the threaded sockets for other bikes that utilize the same levers but don't have plastics for the mirrors, so they go there instead.
I have one coming my way, will be cool to try it out.
250 RAM Mount