@MatthewB7621,
I don't really know too many heavy metal bands beyond ACDC and Metallica who are bands which I enjoy listening to on occasion.
I tend to be a more of a melancholic and depressed geek and I prefer my rock bands to be grungy and/or alternative.
But a good blood pumping tune from a fairly accessible mainstream heavy metal band can do wanders for ones work when one needs to speed things up.