Just saw this post on cult of mac- http://www.cultofmac.com/324683/voltus-is-a-slick-usb-hub-for-mac-that-also-packs-power/
Seems like it solves my only two qualms with the rMB- battery life and no USB ports.
Seems like it solves my only two qualms with the rMB- battery life and no USB ports.