Five Finger Death Punch, Destrophy, Aiden ("Scavengers of the Damned" is amazing), Otep, Black Label Society, Papa Roach. As for slow songs, these bands have a few good ones, but Evanescence is great for relaxing, meaningful songs. "Breath No More" is all piano.
If you haven't already looked them up, can I suggest Skillet? Hey Monday is a little like VersaEmerge and Paramore. If you want slow songs, maybe some Evanescence, like "My Immortal." Just saying.
Found them randomly on youtube.
I adore Madeline.