Deciding to go for a pair of semi-open headphones and need help in which ones to get. I've heard the akg 240 and senn hd580s. currently thinking about either the hd580 or 600 as I have read they are pretty similar in sound sig - correct me if I'm totally mistaken on that. The 580s were extremely comfortable to wear and listen to. But please make suggestions on what, if any, better can there are out there. Looking to spend no more than $200, less is better. My source would either be my PC-->EMU0404 USB or my fuze-->caffeine amp. And most of what I listen to is 320, flac or highest VBR. Thanks!