Vanden Plas, another very good band-are they power metal?
Metallica's Black Album might as well be power metal.
The problem though with power metal genre, is that there is a total lack of new ideas. The genre is stale, and cheesy. Every band has copied Helloween, Priest, Malmsteen and Maiden. After one listens to more than a dozen bands- one will notice that every band sounds pretty much the same- the biggest differance may be that one singer doesnt scream at such a high pitch as another power metal singer. I have to say there are only 6 or 7 bands that seem somewhat original to me- and I think I have named them all.
It seems to me that most power metal fans listen to these many stale bands just to admire the musicianship of a guitarist- or a hook they hear.