I should probably have quit whilst I was (relatively) ahead, and do not doubt that nothing could top bowing out with Parsifal and Europeras. However, I am told that one should never say never again, so, at the risk of seeming like one of those people who insist and insist again, 'just one more time,' here goes...:
Stockhausen, Dienstag
Mozart, Don Giovanni
Monteverdi-Berio, Orfeo
Pfitzner, Palestrina
Gluck, Iphigénie en Aulide
Janáček, Jenůfa
JC Bach, Amadis des Gaule
Rimsky-Korsakov, Tales of Tsar Saltan
Rameau, Zéphire, and Strauss, Friedenstag
Purcell, The Fairy Queen
Dvořák, Rusalka
Weill, Der Silbersee
Enescu, Œdipe
Handel, Theodora
Birtwistle, Yan Tan Tethera
Wagner, Tristan und Isolde