hehehe, I also have a Sonata II and it is also a mess

. Not to mention I have a Sonic Tower in there, which doesn't help. What I did was to wrap electrical tape around all the cables from the PSU. I used black tape, so it looks pretty good. It's still much messier than my Sonata I was though. For me, it's the fact that the SATA power connectors are kinda short and that the IDE power connectors are all on only 2 lines that makes things difficult. Here are some links to pics of my insides:
Pic 1 Pic 2
Edit: updated links