http://www.cableorganizer.com
Best place for cheap sleeving supplies IMO, i'd recommend sleeving that IDE/FDD(cant tell which from the picture) cable you have there, Its not difficult. You make a slit between the two wires in the cable every 4 wires, then make it look basically like a thing of spaghetti. Next,you get 3/8" PET sleeving and stretch it over(you put the IDE connector sideways so it can be slipped over it as well as the cables). Then, use 1/2" 3:1 or 4:1 heatshrink and use that on the ends.
Otherwise, cable management in that is pretty good