Lamb of God has a nice angry sound. I may have to crack open the wallet.
Slipknot is good too. Funny story: We used to have this goofball repair tech where i work. One of the other guys on the bench used to play Slipknot once in a stray while. Goofball was a "guitar instructor" on the side, and apparently had an issue with the music. He finally popped one day and started screaming "DUDE, WTF !!! IT SOUNDS LIKE SOME GUY IS GETTING IN THE Etc, etc...

Needless to say, Goofball is no longer with us.