Here we go
Great choices and nice list. Some I like as well and a couple I like I never would have really thought of, so I replied about those.
Dirk Thurisch (Angel Dust) : he's all about emotion and tone, this guy is so underrated.
Dirk is a fair vocalist, but his passion is off the chart and he is a great frontman. When I think "metal" Dirk is one of those artists that pop into my head immediately.
Blackie Lawless (WASP) : the kind of guy you can recognize from miles away, incredible tone! I'mm a wiiiiild chiiiiiiild, I waaaaant youuuuuhouuuuouuuuuuu
That's really a great choice. Due to their image and some cheesy stuff BLackie doesn't get the kudos he deserves, but the guy can flat out sing.
Glenn Hugues : how could I forget Glenn? He rules and always will!
Glenn is simply amazing.
Michael Sweet (Stryper) : hehe yes I like him, he sounds like a girl at times but his vibrato is unique! Very gifted for melodies.
Nothing wrong with that choice. He is one of those guys I say is born with a "golden throat" like JLT and Steve Perry. "Normal" people just can't sing like that, even the "gtreats" out there.
Bryant