Since the option of Candlemass is not there, I'd have to say:
- Motörhead when I really need to bang my head senseless, and
- Metallica for those calm nights home when I need to get to sleep. (That's not an insult mind you. Not many bands can make me fall asleep with a smile on my face.)
{Of course, I also listen to Simon & Garfunkel with great joy, so my opinion shouldn't count for much among you true metal bangers.}