I need a new pair of headphones. I've had a pair of closed Sony's for some time that are getting a bit ragged. It seems the 580's are highly recommended but difficult to find. Are the 590's the replacement and are they considered to be improved ver the 580's? Also, I'm not familiar with the open-air design. Does this mean that other people in the room can hear them quite loudly and find it rather annoying. Which other products would be comparable alternatives at under $200. Thanks.