I think it depends on which sound you want more of. "Metal" is kind of general because each era has its own tone! Any of the recommendations in this thread would work fine.
If you want more of the 80's thrash tone, I would recommended the DSL more, or a Mesa Mark III if you can find one. If you want more of the modern tone of like Whitechapel, Machine Head, metalcore, etc... then the 5150 would be good. The 5153 would be a good modern version of that. If you want something thicker like Cannibal Corpse or Nevermore, then the Recto would be better, but I would recommend an OD pedal with those just to tighten up the sound.
It would probably be good to watch one of those "high gain amp shootout" videos on Youtube where they compare like 10 amps. See which flavor you like better.