I think in cases where there is no dedicated cable management system, the cables look better when you tie them together rather than try to hide them. Obviously hiding away the cables that aren't used is good, but I tend to tie the power cables in one "trunk," and then have each cable split off to it's relevant spot. I don't tie the SATA data cables to the power cables (for obvious reasons), but I do try to run them vertically downwards (in most cases), then across, then back up to the SATA connector on the motherboard.
---------- Post added at 10:48 AM ---------- Previous post was at 10:46 AM ----------
I can't tell from the pictures OhSnapWord, does the PSU have a 24 pin power connector, or is it only 20 pin?