Halford is definitely a wicked vocalist.. Bruce Dickinson is fucking amazing too, great range. For pure screaming though, few can beat Tom Araya..
The dude from Pantera will never be beat. But he is followed closely by Randy Blithe from Lamb of God.
i cant believe i forgot phillip well my favourite is pretty obvious also: chris cornell maynard dax riggs karyn crisis and thats all i can think of off the top of my head
I can't narrow down to just one, so I'll name a few of my favorites... - Mark Boals - Rob Halford - James LaBrie - Sebastian Bach - Phil Anselmo
It's either Ronnie James Dio or Rob Halford if you're looking for range. But personally i think it's Bruce Dickinson! With an honourable mention to the very underrated Rob Rock.
I like Rob Rock. Of the Impellitteri albums I have, I must say I prefer Rob Rock's voice over Graham Bonnet's, though, I like Bonnet, too.