I believe this is chronological rather than ranked.
Ainadamar. I keep looking to see what Opera Parallèle is going to do in the coming season, but nothing has been announced. Here is a film of the opening.
Parsifal - I can't believe I'm saying this. Here is a clip of Kaufmann singing "Amfortas! Die Wunde!"
Neon lightning in the last scene of Rigoletto in the Met simulcast. I couldn't find a film.
Cecilia's Norma recording. This clip is "Mira Norma."
Discovering that the American Bach Soloists play in Davis. I love the way they play Bach. Here is the Kyrie and Gloria from the Messa in H-moll.
Anja Harteros and Jonas Kaufmann in Il Trovatore from Munich.
Natalie and Matthew in Tales of Hoffmann.
Finding the film of Die Walküre with James Morris on YouTube.
And the best was Ainadamar. These include live, simulcast, filmed, recorded and streamed performances.