I could live without Blind Guardian, I could live without Helloween (though I would miss three non Kai albums; MOTR,TOTO, and BTR), but you would have to kill me to get me to stop listening to Gamma Ray. One of the funnest bands ever.
There are at least four albums where half the songs on each are like, "Yep, this is exactly what metal is supposed to sound like". Awesome vocalist, awesome guitarist, awesome songwriter. Total metal hero as far as I am concerned. Any other fans?