its not so bad
here's a couple of tips:
A. tuck as much cables as you can at the CD-rom bays use you'r intuation to wire them to the required spot as invisibly as possible
B. You could get those clips that on their base they have a plastic glue [so they can be removed if needed] and clip some cables to invisible spots in you'r case.. like that empty rail you got there under the PSU...
Thats what I have in mind ATM.
those tiny PCI slots are PCI-E X1 I thikn or X4, forgot how it goes since I don't got a very up to date mobo, check you'r mobo manual for exact information..
I believe they are used most of the times for surround kits.
-Jo.