Most of my faves have been mentioned... But I'll add Sidney Poitier, Orson Welles, Humphrey Bogart, Lee Marvin, Charlton Heston, Dennis Haysbert, Fred Gwnne & of course Sean Connery. Plus, my opinion is that a vast percentage of Benedict Cumberbatch's appeal is his resonant voice
& last be not least, the long forgotten Thrur Ravenscroft, most notable as the singer of "You're a mean one, Mr. Grinch"
How about the other end of the spectrum, people with wonderful character voices, like Wallace Shawn, or Louis Armstrong or Don Knotts?