It seems (at least to some people) to be almost a law of nature that the more monitors cost, the better they are. Is it the same with headphones? Is there perhaps some kind of constant price ratio between monitor and headphone quality. I mean in a semi pro environment like my own where I have low- to midrange priced monitors (and soundcard, mics etc) - is it meaningful to spend a lot of money on headphones? If I have monitors for $500, what price range should the headphones be? Or is this a non-relevant question? What headphones should I get? I am willing to spend $100-$200. Suggestions?