Slayer- Show No Mercy, Hell Awaits, Reign In Blood, South Of Heaven, Seasons In the Abyss, divine Intervention, Diabolos in Musica, God Hates Us All, Christ Illusion.
Dethklok because they are such a brutal band to see live. Seriously,... they put on a great concert. I know,... 'cause I went to the Dethtour show in my area.
Oh, and to add, Dethklok are pretty much just heavy metal with guttural vocals. Not really that much death metal in them. (It's similar to how Children of Bodom are just power metal, but with screams instead of singing).