Who is the best VOCALIST???

Mikael Akerfeldt
Mikael Stanne
Bruce Dickinson
Layne Staley
Mike Patton (check out his side projects to see what I mean)
Glenn Danzig
 
If anyone has heard of Don Ross (the guitarist), I really enjoy his voice. He doesn't sing much but I personally think he has a great singing voice. You can hear his vocals on the song 'Any Color But Blue.'

It goes without saying that he is a fucking mean guitar player too.
 
i. e Tori Amos?

Shes a great piano player and has a great voice but her lyrics annoy the ever loving shit out of me

Depends on the lyric. A significant amount is slightly annoying tho.

Just thought I should maybe add Daniel Gildenlöw to my list. I just don't really like all of his vocals.