Zero Hour than any other, but... doubt it.
I said Pain Of Salvation, but the votes tend to be leaning towards Edguy. Personally, I would rather see Edguy over POS. I liked Gamma Ray and Blind Guardian, too. Just doubt either would be back. I really hope it is not Angra or Silent Force (I love Silent Force on CD, but live, well that was a different story. Angra - blah.)