Well it seems that the optical is a no-go. I hooked it up fine but I was getting no luck getting any sound out of it. I tried mixing with options and and the like in Realtek HD Audio Manager and in Vista's sound options with no results. Back to the drawing board it seems...
Update: Look at this! I just came across it when I was looking around, so with that in mind...any ideas?
All I see are 6 slots that are exactly the same, like little microphone slots all next to each other. If necessary, I can take a picture of the back of the PC and upload it to my server and link it here.
FINAL UPDATE: Scratch that, turns out that I somehow messed up with the Audio Manager, somehow not selecting 5.1 and instead stereo. It now works through optical. HOORAH!!!!