Ooops, I am just not doing well with links today

Here we go:
http://pics.bbzzdd.com/users/mechBgon/interior1.jpg
If you look up high in that photo, you can see that a bunch of cables go through a round hole up there (well, maybe you can't see it, oops). I was able to stash unused cables behind the mobo tray and also route others, including the main power cable, back that way too. You can do something similar on your SLK3000-B... there's a gap between the mobo tray and the 5.25" drive cage, and you can slip cables between them and route them down behind the HDD rack, including the main ATX cable if your mobo's layout encourages this. I don't have my digicam at home or I'd post some pics. Stashing unused cables back there will tidy things up too.
The PSU sits on a little shelf, and there's a gap at the rear end of it. You can route cables around the rear of the PSU and out that hole. I routed my 4-pin ATX12V cable that way since the fitting is near the upper-rear corner of the motherboard, and you can route fan cables that way too (take both side panels off to get at this easier).