This is a really tough one, looking through that list really demonstrates the depth of quality the genre has enjoyed through the years. I dont think I could choose between Sepultura, Sodom, Kreator, Annihilator and Testament in all honesty.

I went with Overkill, but only because there was no Coroner. Or Tourniquet, for that matter.

I went Sepultura. I was introduced to them via my cousin in the days of Kazaa, and he downloaded them to my computer. Really dig 'em.

I've only listened to a little of them and I thought their vocalist blew.

Overkill, Coroner, or Tourniquet?

Went with Exodus. Testament and Sepultra were close, but Exodus has always been a personal favorite.

My bad. Tourniquet.

Ah. Yeah, that would make sense, as they changed singers a few times, and they have always had a few singers in the band. For good-ish singing (not that great, but whatever) and hardcore shouting I would look at Pathogenic Ocular Dissonance. It's their best album, in my opinion.

I have to say that the fact that they're labelled as Christian metal on Wikipedia makes me suspicious of their quality as band.

Yeah. I know all Christian metal bands can't be ****. But the track record isn't very good so far.