Angel Tarragon
Dawn Dragon
Final Fantasy VII score for battle themes and boss fights.
I usually chime in in these threads and propose Corvus Corax, a german footstomping medieval rock band, and will do so again.
For combat music I'd recommend their live albums, Seikilos, Tritonus, and Viator. (There are samples on their page, go check them out! (Music -> Samples))