To Kill a Mockingbird, Catcher in the Rye, The Scarlet Letter & of Mice and Men are all great books that will lead to some fantastic conversations. If you have younger children (under 12) I'd add Bud, Not Buddy as it's another good book based in the depression, but told from an African American perspective. A great book not on the list is The Grapes of Wrath--compelling story of the depression era. The Outsiders and The Red Badge of Courage are all great for young teens. Have you read 12 Years a Slave? might be another good one for discussions. The Birchbark House is a Native American story. And everyone should just read Jack London's and Louis M. Alcott's books just because they are great stories.
Feeling ignorant, here as I haven't read them all. From those I have read, I would go for To Kill a Mockingbird, Poems of Robert Frost, Little Women and Uncle Tom's Cabin. Definitely need to do some more reading. There are times when having spent six years in medical school and the next few working leads to an uncomfortably uncultured feeling. On another subject, I have just updated my UK Christian home educator blog list and added your blog to it. Hope this is OK.
Whatcha thinkin'? Don't be shy if you've got something to say!