I use a mini 4-port USB hub that plugs into both my Macbook USB ports - I have 2-3 DAC/amps plugged in most of the time, and often also a desktop USB drive for Time Machine or a USB Digital TV card. I admit that most of the USB devices only use the USB for the DAC and charging, but not driving the amp too (don't use my 3MOVE with no battery very often, and that does run both off 5v). And the 500Gb HD is powered from the wall.
Thank you for your concern.
There are many rumors about D10+ or D11, we just want to clarify that we dont have any plan about the D10+ or D11 at this moment.* One thing that I can confirm is we will not release the D10+. We will think about the development**of D11 or D20 in the future, just everything has not be planned yet, and the development will take at least half year.