Narrowing it down to 8 was horrific. That's not even one per season! I ended up with:
Beyond the Sea
Clyde Bruckman's Final Repose
The Field Where I Died
Painfully, I had to leave out Squeeze/Tooms, Oubliette, Small Potatoes, Tithonus, Bad Blood, Theef, all things and probably a dozen others of my favorites.