Well, metal is all about distortion and loudness but I have heard it being reproduced well on a more warmer stat set up of a Kgst/007 combo. Just didn't have that wide, airy soundstage that I was expecting. It could have been due to the less than ideal seal of the ear pads as my then pair of 007s had a loose headband..
Hahahaha...well, I do find rap music to cause more distortion even with my lesser dynamic set up yet I still enjoy the occassional 2 or 3 rap tunes
The vinyl route is very tempting but the need to keep the records clean and the extra hassle in handling and storing them is keeping me away..for now. But I would wholeheartedly believe it's worth the effort to plug it into your BHSE rig - I can vouch that the record will sound better tha digital
I have tried the vinyl route with my headphone systems with quite a high quality Origin Live Turntable, Tonearm, Dynavector MC Cartridge and fully balanced (input and output) Chord Electronics Phono Stage and found that I had to really turn up the volume knob to over 70% (normally only 30 to 40% with my CD Transporter and DAC rig).
It also didn't sound as good (less detail, sound stage, separation of instruments etc.) as my CD rig even when using 180g and 200g records and cleaning them on a Keith Monks RCM. So I sold it.