Nightwish! My bf was extremely shocked the other day when I told him Arch Enemy were fronted by a female. Angela Gossow is cooler than Tarja Turunen though. Voltaire (check out a sample here: http://www.voltaire.net/mp3/Voltaire_-_Dead_Girls.mp3 ) or Apocalyptica (see here, Somewhere Around Nothing is the best http://www.apocalyptica.com/media/videos.php ) Providing links because I don't think many people here will have heard them.
Bullet For My Valentine. I saw 30STM live and they weren't very good. Jared Leto was endlessly promoting their new CD. Staind or Finger 11?
I've never heard of The Postal Service but I have heard of Straylight Run even though I don't remember how they sound. lol I'll go with: Straylight Run Fallout Boy vs My Chemical Romance
Evanesence, although Nightwish only lose because of their ex-bitch of a vocalist. but with new vocals, who knows... Avril Lavigne vs. Ashlee Simpson
Avril. I don't really like her music, but I don't really like Ashlee's either, and Avril's canadian. Obvious edge. Burn The Priest vs Lamb of God.
Lamb of god, since I haven't heard any material by Burn the priest. Bullet for my Valentine or Atreyu?
Bullet For My Valentine, Atreyu are over-rated if you ask me, they're alright but they're not great... besides The Poison is one of the best albums I've heard. Slipknot vs. Stonesour
Caliban. It's a toss-up, though, because I don't know much about either band. Dropkick Murphys vs. Flogging Molly?