High school Junior checking in.
DO NOT ASSIGN BILLY BUDD. Your students will hate you for all eternity. In fact, avoid Melville in all forms: Bartleby the Scrivener, Moby Dick, etc. Also avoid Henrik Ibsen’s “Enemy of the People.”
I personally did not like Heart of Darkness, and neither did my classmates. The only good thing about reading Heart of Darkness was that, in order to introduce some of its themes, we were assigned Barbara Kingsolver’s “The Poisonwood Bible,” which I love and would definitely recommend.
If you’re going to do Shakespeare, which I don’t have a problem with, remember that they always assign the tragedies in high school (Macbeth, Julius Caesar, Hamlet, etc.) and that you might want to try a comedy. Much Ado About Nothing has some particularly great insults. The Winter’s Tale, while not widely taught, is fun and interesting. If you do The Tempest, make sure to examine it from the point of view of its being Shakespeare’s last play, and how Prospero often speaks for him saying goodbye.
If you’re going to assign Grapes of Wrath, give the students enough time to get through it. It’s a slow read.
The Scarlet Letter, while objectively a good book, got irritating very fast with its blatant symbols.
I liked The Great Gatsby, Death of a Salesman, and The Glass Menagerie.
In junior high, I read and enjoyed William Saroyan’s “The Human Comedy.” It’s not particularly challenging, but if you’re teaching a lower-level class, they might enjoy it.
In addition, I think it’d be worhwhile to assign The Curious Incident of the Dog in the Night-Time, by Mark Haddon. I wrote a paper on it this year. It’s amazing, and totally unlike anything your students will have read before. It’s a totally different discussion when you’re analyzing a character’s utter LACK of emotion. (The protagonist has Asperger Syndrome. He narrates the book. It’s very interesting to see the events through his worldview.)