The Dark Phoenix Saga. This story line has everything the X-Men ever were or could be: love, loss, tragedy, betrayal, romance, insane superpowers, and the introduction of Kitty Pryde. It had all my favorite X-men at the time, and my least favorite of all time (I hate Cyclops with a passion). It was Claremont and Byrne. It was great story telling and art that jumped off the page. It was and still is a classic.
It’s fitting that this ends my ten book series as it’s one that I’ve been wanting to reread lately.