What free books should I download to my new Kindle?

I ordered a Kindle, and it will be arriving any day. Amazon has over 15,000 free books. Gutenberg.org has twice that many in Kindle format. Openlibrary.org has some ridiculously high number of books to download.

I want to go hog wild and get all the free books I can.

I love classics. I love really good literature. I can’t read pulp or schlock. Fiction, primary sources of non-fiction accounts of travel or adventure, theater, plays, poetry, biography, and humor are some of what I love.

I like everything from ancient Greek literature right up to the 1923 cut off date to make it free.

What do you recommend I hunt for and read on my new toy?