My problem is I'm unbelievably picky about music. There's no one that could tour with Disturbed and do better in my opinion. When they were with Killswitch, Chimaira, and Lacuna Coil, I was literally BORED until Disturbed got on stage.
It's either going to be a band that can't possibly upstage Disturbed because they're as bad as the bands mentioned above, or someone who can match Disturbed's melodic style and still be hard hitting enough to entice their crowd. I think KoRn, Godsmack, or Avenged Sevenfold would be the most likely, though I hope to God it's not Godsmack. I hate them. (Sully Erna excluded. He's a badass.)