Sinewave Revolution
I chose the Son 28 dynamo and went with the Sinewave Revolution because the front bike rack I use is suspended and fills the fork tube so I can't run a wire up it, I was going to use The Plug III but it has to be mounted in the fork tube also. The Revolution can be wired however you want. I put the unit in my bar bag and can charge two USB items at once when moving 10 mph. I like keeping it out of the weather too. When my under-powered Garmin 1000 start to run low (after 5 short hours, or Less) I can run a USB cord out of the bar bag straight to the GPS mounted on the bars.