I use a Mio DigiWalker 410. They're quite inexpensive on ebay right now, sub $150. I've tried a few mounts and ended up liking the techmount fairing mount the best.
For anyone interested in mounting an auxiliary power socket, I posted a step by step walkthrough on the daytona deliberations page.
http://www.triumphrat.net/daytona-de...?highlight=gps
Happy Riding.
-Scott
