I just received my HD 600s refurbed from Amazon for $180 shipped and boy am I GLAD i decided to purchase them. I sold my 650s about 3 months ago because I got speakers and thought I wouldn't be needing them anymore but I'm listening to the 600s now and they sound good
My history with these headphones go somewhat like this. Bought HD580s. Sold them. Bought 600s. Sold them. Bought 600s again. Sold. Bought 650s. Sold. Bought 600s.