If you have no room on the back, all I can suggest is moving that hard drive to the bottom slot. Then, run your cables into the empty drive bays. At least then the huge bundle of cables is somewhat hidden. You have an air intake there though, so you may want to disregard this advice.
I found a review for this case that may give you some ideas.http://www.hardwarecanucks.com/forum/hardware-canucks-reviews/33182-cooler-master-elite-430-atx-case-review-9.html