To continue my list...

Dragonforce
Nightwish (excellent opera female fronted power metal)
Guardians of Time
Insania (stockholm)
Nocturnal Rites
Nostradameus
Sabaton


Trust me, listen to metal (real one with all musical, instrumental arrangements) in a nice audio system gives it a totally new experience.

Axiom M60s, QS4s, VP100 Onkyo TX-SR804 Oppo 970HD Rotel RB-1080/RCD-1072 REL Q150E sub, PS 3