One of my favourites is Kamelot, and of course Nightwish I like a few of Mercinary's songs, as well as Helloween.
Even though what i do like i love, i find myself quite picky within the genre too. I'm not all that much into lyrics about dragons and castles, and similar to my selective love for Metal, get turned off by many power metal artist's vocals.
What power metal bands are you into (if any)? I'm quite interested in how heavy power metal can get. I wonder if there is any good 'heavy power metal' around