I came in here to say in flames, they are amazing. I used to be into metal back in high school, and I like to go back and listen to it alot. Some other good ones:
All That Remains
Smile Empty Soul
Chimaira is ok, a little to core for me
Lamb of God
Bring me the Horizon
These Green Eyes
Some of those may be more alternative, but they are still good. I have a ton of metal bands on my old ipod that I found on some website a while ago, not sure if they are big names or not, but there were some good songs.