The Cary, Levinson, and Meridian mentioned will work for rock and metal. I've heard them, but not in my system, I haven't heard any of the Thetas, so I can't somment on those.
You might also consider an EVS Millennium DAC 1 ($300-400 used) or Millennium DAC II ($700-850 used) on audiogon. Although discontinued, hand-made in low volumes, and single input - the millennium dacs are excellent for rock and metal. Very fast, tight, articulate, tonal, palpable, etc bass. Lots of good slam. Detailed, but never bright. one of my few complaints of the DAC 1 (which I have) is the center image is shifted slightly forward, ever so slightly. At least more so than I like. I tend to prefer a sound where the center performer is a little farther back. Mucho better than the MSB Link DAC 3 for rock. I throw the millennium out there as a little suggestion even though you are looking a little more upscale.
You might also consider an EVS Millennium DAC 1 ($300-400 used) or Millennium DAC II ($700-850 used) on audiogon. Although discontinued, hand-made in low volumes, and single input - the millennium dacs are excellent for rock and metal. Very fast, tight, articulate, tonal, palpable, etc bass. Lots of good slam. Detailed, but never bright. one of my few complaints of the DAC 1 (which I have) is the center image is shifted slightly forward, ever so slightly. At least more so than I like. I tend to prefer a sound where the center performer is a little farther back. Mucho better than the MSB Link DAC 3 for rock. I throw the millennium out there as a little suggestion even though you are looking a little more upscale.