I went and bought a couple of these plugs from walmart. They fit into a standard 12v cig outlet, then wire up a cig outlet on your bike. Gasman has the same setup.
I also have the medium aqua box , so far it hasnt let my phone get wet, and its been caught in some pretty nasty rain. Been contemplating the sena setup too. the ram mount system is awesome, sturdy, strong, stable, and easy to take on and off.
http://www.ram-mount.com/CatalogResu...0/Default.aspx