I just recently found out that I prefer a darker and thicker signature for rock and metal, so for now, I'm sticking with the Hifimans or audeze. I'll still try to listen to some grado's though.
Man I wish I had the SR-009's :P
Also, do you guys think the HE-6 is better for metal than the HE-500? If so, it will be LCD-2 vs HE-6 for me.
HE-6 is quite a bit faster-sounding than HE-500, so yes I'd say it would perform much better with metal.