I've got a SON 28 on the Fargo, with an e-Werk, for topping up Exposure Diablo, or the 800, or phone - one device at a time as required, no USB hub to reduce current and to keep the whole setup as simple and uncomplicated (read reliable) as possible. It needs to survive a heavy downpour and freezing overnight conditions to be reliable, and I don't want to be fussing over miles of cables and connectors.
Still deciding if I'll kit up the fat with a power system.
I hear you on the reliability and simplicity aspect! Your system sounds really nice. My problem was (is) using stuff I had and going on a budget. My old Garmin 60csx is AA battery powered so when you plug in the USB cable to run it, it has to come off a cache battery. The old smartphone I use simply as a music player is not waterproof but hey it still works. My cygolite charges with a usb cord too so hence the hub.
I am thinking of going with a anker cache battery with a dual usb output so I can eliminate the USB hub and some wires.
How do you recharge you phone or don't you mess with one?
It use to be the endurance bike packer went with everything battery powered but now it looks like internal batteries and a dynamo hub might be the way to go.