Yeah that why I asked, the HD598 are quite tame. They're a good all rounder, but really laid back and relaxed. Right now I have some Beyer DT990 Pro and I really enjoy their low end, even tho they are more of a V sound signature, with really nice bass and highs, but the mids are not their strong point.
What I'd recommend would be something along the lines of an HD650 (for something more refined, but still dark) or Fidelio X2 (for something just more fun and plug'n'play).