Well, I'm going over the first round of copy editing of my Superman book. I've seen the cover, and ad copy. And I bought a house.
So here's a list of "essential" Superman stories from comics to mull over, from Comics Alliance. Lists like this are interesting for their concept of essential, or essence, as it informs their creation. In this case, the author, Kieran Shiach, writes, "The stories in our list all follow a general theme that focuses on the character's inherent goodness and inspirational qualities," and so excluded are alternate takes on the character. Shiach wants the list to be a good starting point for someone who wants to jump into the comics without a lot of previous knowledge. Interesting choices.