Okay I tried to assess the situation inside my computer and took a few more pictures.
http://i.imgur.com/4BcXt.jpg
http://i.imgur.com/ntrOK.jpg
When it comes to the cables, what I basically need to do is get longer SATA data cables. The ones I'm currently using for my disc drives are too short. If you notice in the pictures below, one of my hard drives is connected to a long blue cable that's able to run all the way around my heatsink and into the motherboard without getting in the way of anything. The three orange ones are forced to go straight to the motherboard in front of everything else because they aren't long enough to make crazy turns and such. What you see is literally the only way I could hook them up. I'm having a bit of trouble finding the right kind on Newegg.
The situation with the PSU SATA cables isn't quite as bad. I've tucked most of those in a space between the PSU and the disc drives but even those didn't give me a whole lot of leeway in how I could hook them up.
Lastly, there's a possibly MAJOR oversight I made: I just noticed what seems to be another intake vent at the front base of my computer that was pretty much completely blocked with dust. On the other side of it is a fan. I don't know if that's one of the main fans for my computer, but for the entire four years I've owned this system I didn't even know it was there. Since cleaning it out my GPU temps are the same but it couldn't hurt right?
EDIT: I tested the GPU temps for some more games. A really low-end game with little-to-no 3D graphics like
EDGE brings my temps up to 50C, watching a YouTube video does the same thing.
Modern Warfare 3 brings my temps in the 70's, no higher than 77C.
Skyrim get's my GPU in the 90's, and
The Witcher 2 puts it as high as 95C. Should I be worried about TW2?