Great idea for a thread!
Personally for a festival I would want it to start out strong but mellow and then build into an all out ROCK spectacle!
I'd book:
A Perfect Circle - nobody can get a show started like Maynard
Danzig - All hail
Foo Fighters - absolutely amazing live performance
Black Label Society - nobody shreds like Zakk Wylde
Godsmack - Great live set, very energetic
Superjoint Ritual - Brutal metal from Phil Anselmo
Rob Zombie - Monsters, Strippers and Metal... oh my!
Hatebreed - The most BRUTAL pit I've ever been in
Metallica - What else needs to be said?
Amon Amarth - One of the absolute best bands live EVER! Viking Metal!!