the thing about metal is that its good if im pumped, but theres no way that it could be the only thing i listen to, and right now i have through the fire and flames and a song called godspeed by anberlin (not sure if you can classify that as metal or not)
I listen to metal as I'm falling asleep :3
Try:
Asking Alexandria
AtreyuAvenged Sevenfold (older stuff)
Evergreen TerraceFuneral for a FriendThe Human Abstract
Killswitch Engage
Soilwork
Story of the YearWe Came As Romans
Most of this is not very hard metal, but it's catchy singy metalcore. Give it a listen, let me know what you think. Just look stuff up on youtube, I'm too lazy to include links.
I've bolded bands that are especially good introductory to metal (metalcore, at least). Dragonforce is not meant to be listened to.