Some of my favorites:
Al Pacino, Kiefer Sutherland, Gillian Anderson, Elisha Cuthbert, Jillian Hennessy, Deborah Kara Unger (I just love Canadian accents... Seriously, Unger has one of the sexiest voices ever.), Mikael Persbrandt, Kjell Bergkvist, Ron Howard (I love how he sounds almost exactly the same now as on Happy Days), Michael Douglas, Charlie Sheen, Alan Young, Allan "Rocky" Lane (I couldn't possibly imagine Mister Ed having a better voice), Conchata Ferrell, Jon Cryer, Cindy Williams, Penny Marshall, Don Most (He's still got it!), Henry Winkler, Bea Arthur, Estelle Getty (the two Golden Girls who make me laugh with their tone and inflection alone), Laura Prepon (The good kind of deep voice. I was always more team Donna than team Jackie
) David Duchovny, seriously, this is gonna take all day...
Some of my least favorites:
James Corden (You get tired of it quick), Leelee Sobeiski (I really hope her voice doesn't sound as bizarre in real life as in movies), Penelope Cruz' American accent (For some reason it just bugs me), Josh Gad (Whenever I hear his voice I want him to go away), Kristen Johnson (The bad kind of deep voice)