So you'd recommend the DJ100s over everything else (in my price range)?
Going back to your original requirements, I think that the Koss has the tight, punchy bass that you want, but at the end of the day it has a closed soundstage, even though it sounds wider than most. If you want to emphasize more the larger soundstage, you'd probably be better off going with an open headphone, but I think it's a suitable closed headphone choice.
The other one that I would consider is a Fischer Audio FA-003 variant, like the Brainwavz HM5. They have tight bass, a wider soundstage than the average closed headphones, and they sound quite good for the price. They're a technically superior headphone, but with less bass emphasis. I'd call its sound signature a bit more in-between the two.
