A band that's known for being difficult, or a band that will be difficult playing with Megadave? Basically count out any band that is slightly anti-religion at all or doesn't jack off Alex Jones.
12/07 - Exodus
12/08 - Blackalicious
12/11 - Saves The Day
12/16 - Pallbearer
12/18 - Orange Goblin OR Wolvhammer