use your computers 12 and 5v power supplies. I just wired this up last night. I was tired of using electrical tape and screw on wire connectors. it wasn't pretty and wasn't safe so I took a hard drive power splitter and cut off the one Molex connector. I ran wires from the 12v, 5v and two grounds to a connector peice. I'm not sure what it's called but it has 8 connections on one side and 8 on the other side and lets you screw wires into place connecting from one side ot the other. Anyway, i connected the 4 connections to this wire connector (bridging the wires so that each peice, 12, 5, gnd, gnd) occupied two spaces. Then on the other side i connected some devices. my fans and lcd screen run on 12 volts so they got that, and the USB hub gets 5v so i connected a wire and ran it outside of the box to the USB hub. i purchased a connector from radio shack to connect into the hub. take your hub in and see which fits.
sorry if the description isn't great. i hope to have pictures soon.