It will be impossible to ever come to a consensus on this since everyone has their own opinion of what constitutes a "great" voice. As a classically trained singer, I prefer voices that show some sort of technical knowledge but not be so mechanical and stodgy where they aren't able to convey character.
Some of my favorite from the past include John Raitt, John Cullum, Robert Goulet, and Howard Keel.
Presently I like Stokes, Brian D'Arcy James, and even Phillip Quast, but still consider Anthony Warlow as the alpha and omega of Broadway singers -- although he has never actually performed on Broadway.
"You pile up enough tomorrows, and you'll find you are left with nothing but a lot of empty yesterdays. I don't know about you, but I'd like to make today worth remembering." --Harold Hill from The Music Man