If you are adding the Holmes stories to the list, I would reccomend
The Annotated Sherlock Holmes by William S Baring-Gould

I would just add to the growing list:
White Fang By Jack London
Down and Out in Paris and London By George Orwell
The Old Man and the Sea By Ernest Hemingway
Tresure Island By RL Stevenson
If I Lived My Life Again By Sir Winston Churchill
And anything written by Lama Surya Das

Happy Reading,
Sara