Wolf is probably not what Glenn was looking for, but talk about a band with a big cult following from the "classic" metal crowd. Wolf is a really good band.
Having said all of that...... the lines are always really blurred between the various subgenres of metal, but I think the line gets really thin when trying to define what is dark power-metal and what is heavy traditional metal. I have always labeled the darker power metal bands as "American style power metal" though that may not be fair to the mostly European bands that incorporate the style, since early American power metal bands probably got the idea from bands like Accept and Iron Maiden in the first place.
I don't really remember the point I was going to make at the end, but being a fan of oldschool metal, I really miss bands like Angel Dust and Breed era Tad Morose because they represented a modernized approach to the early power metal style. The guitars didn't get watered down too much with keys and there was enough throw you in your seat power mixed with melody there to make a great listening experience. Metal tends to be pretty cyclic though and I am sure there will be a wave of new "American style" power metal bands come into the fold soon.
Those types of bands make for a great live act as Angel Dust, Brainstorm, Tad Morose, Balance of Power, Pagans Mind (I know they also incorporate prog, but face it, they are dark and heavy as well) Primal Fear and Evergrey etc. etc. all had a great response at PPUSA.
Bryant