I'm still a firm believer that the best headphones for metal that i have ever heard were the 650s. I have not heard the HP-2 or the L3000, so I can't comment on those, but for me, the slightly veiled, laid-back nature of the HD650's really did it for me with death metal. The Grados were way too fatiguing and the visceral nature of their sound made me want to kill myself, but the softness of the 650s did magic for me with metal. I found the sound to be significantly more rewarding.