Voices I like (off the top of my head):
Lauren Bacall
Diana Rigg
Roscoe Lee Browne
Stacy Keach, Jr.
Ray Walston
F. Murray Abraham
Vincent Price
Bryn Terfel
Shirley Bassey
Orson Welles
Ken Nordine
Annie Lennox
Ken Nordine? Christ, I didn't think anyone else on the planet knew who the hell he was.
Reaching back into the mists of antiquity (i.e., the 1940s onward), my favorite female speaking voices are:
Lauren Bacall
Lizabeth Scott
Sally Kellerman
Kathleen Turner
Lauren Hutton
Claudia Cardinale
And male voices:
Raymond Massey
Christopher Lee
Jonathan Harris
George Sanders
Walter Pidgeon
Peter O'Toole
Of course, voices are one thing, accents are another. I think Jennifer Ellison's scouse accent sounds cute, but to a lot of Brits, it's like the proverbial nails on a blackboard.