An outfit called "Gadget Guy" makes some pretty nice stuff. I'll probably get this one and mount it on a bracket between the two windscreen mounts. That puts it above the gauges and tank bag but not obscuring the road. 
I like this one because I can just mount it and leave it w/o worry of it being ripped of at a gas station or restaurant while travelling. The downside is it's price. The whole kit will cost double what I paid for the GPS itself.