Wow. Gee whiz. My suggestions can’t compete with John Malkovich or Nigel Planer, but…

Some (maybe most?) Star Wars novels are packed with sound effects and electronic voice distortion effects. I’ve listened to Labyrinth of Evil, Darth Plagueis, and Path of Destruction.

Also, I recall being impressed listening to the Silmarillion and the narrator’s pronunciation. Sure, it was a professional production so they had to get it right, but still impressive to hear.