The best vocalists?

Maynard James Keenan
Trent Reznor
Brian Warner

-The last 2 are from trendy goth rock bands ( more Brian then Trent ) but are both very underrated

Mikael Akerfeldt- Give a listen, very powerful, dynamics are nearly unmatchable.

Chris Cornell
Eddie Vedder

-Both appeared on the scene at generally the same time, both very passionate singers, Chris has the upper hand though, his range is incredible.
 
Male vocalists (in order they came to mind)

Freddy Mercury
Trent Reznor
Maynard James Keenan
Mikael Akerfeldt
Tom Waits (love it!)
David Bowie
Phil Anselmo actually has quite a growl
Chino (insert last name here) is highly underrated, I think


Female vocalists

Björk (totally unique)
Tori Amos
Aimee Mann



And from there I'm drawing a total blank..

NP: Some mp3 they said was A Perfect Circle but I dunno if it is... called "Wake the Dead".. lots of really distorted violin.. really cool.
 
Best are:
Vincent Cavanaugh(Anathema)
Aaron Stainthorpe(My Dying Bride)
Nick Holmes(Paradise Lost)
James Hettfield(don'd remember tha name)
Chris Barnes(Six Feet Under)
Garm(Arcturus)
Simon Hastenaes(Arcturus?)
Darren White(Dead Man Dream)
Kari Rueslatten
 

Chris Cornell
Eddie Vedder

-Both appeared on the scene at generally the same time, both very passionate singers, Chris has the upper hand though, his range is incredible.
I second that one. Though I didn't mention Eddie Vedder he is in my top 20 for sure. I'm especially fond of his earlier work. Do you have Temple Of The Dog? It's a pre-Pearl Jam album and Chris Cornell and Eddie Vedder sing together on it. It rivals the best of both bands.
 
These are my faves, not neccesarily the best. No particular order

Clean:
Geddy Lee of Rush
Akerfeldt
Dave Mustaine- love his vocals, or hate 'em
Early James Hetfield
LaBrie of Dream Theater- I don't think his performance on "Scenes" is all that great though
Tarja- Nightwish
Ronnie James Dio
Sebastian Bach- cheesy but still a great vocalist
Bruce Dickinson
Matt of Iced Earth
Ray Alder of Fates Warning
Peter Steele
Maynard
Vintersorg
Ozzy

Growls:
Akerfeldt
Aaron of MDB
Paul of Novembers Doom
The dude in Evoken
The dude in Morgion
David Vincent- ex Morbid Angel