I'm looking for some HPs for my son. When asked, he said his budget was up to $200 used. He listens to primarily power metal, e.g., Blind Guardian. He is looking for a balanced frequency response or maybe just a slightly boosted lower end. He cannot tolerate any brightness as he says it...

I'm very new to the world of headphones but have long been into very high-end 2-channel home audio (over 35 years).  After a recent move, I had to sell most of my 2-channel equipment as I no longer have the chance to listen to it without bothering my neighbors.  So, I'm now looking into the...