How do you mount your GPS? How do you power it? Pictures appreciated.

Debating whether to sprint for the Garmin 660 or stick with my Nuvi 260w. Would be nice to hear it talk to me via Bluetooth to my helmet, but is not a 100% requirement (260w no Bluetooth). I realize it is not weatherproof. Figure could just pull it if the weather turns rainy.

I have an 09 RT and use the BMW tank bag.