Lamb of God
Meshuggah
Pantera
DOWN
DevilDriver
I don't know if I know of any power metal bands that use harsh vocals. I love those vocals, though. Some of my favorites would have to be Mikael Åkerfeldt, Vald (Blood Red Throne), Matti Way (Abominable Putridity, Ex-Pathology), Johan Hegg of course, Simone "Som" Pluijmers (Cerebral Bore), Jamie Stewart (The Absence), and although I'm not usually a huge fan of high pitched vocals, especially in death metal, I love Kevin Quirion's vocals in Order of Ennead.
I've really tried to get into death and black metal but it doesn't stick for me. I can do bands that mix metal genres, like Children of Bodom and prog bands such as Opeth or Orphaned Land.
I also just have issues with the satanism aspect of black metal. I know it's mostly a stage thing but for the few who take it seriously it rubs me the wrong way. More of a "bad juju" kind of thing, ya know? That being said, I love Shaggrath's guest vocals on Kamelot's The Black Halo.
With death metal, most that I've been exposed just doesn't really connect with me. I'd say it all sounds the same, which can easily be said about power metal as well, but there's too much dissonance in it for me to get any enjoyment out of it.
To each their own, though.
My favorite Nile song.
Adam: Lookin straight grizzly.
Blake: Bitch betta have my honey.
I'm not really into Manowar, but this song is awesome.
http://www.youtube.com/watch?v=6EviiD3--iU