Assuming the question was wat I would like to be able to play, not what I can play.
J.S. Bach Goldberg Variations
Liszt - Sonata in Bm
Liszt - Totentanz (with orchestra, otherwise don't bother)
Scriabin - Sonata No.10 (or 5 or 7 or 9 or 8, ack!)
Barber - Piano Sonata Op. 26
(the fifth one was a hard one, no Beethoven, no Medtner, no Bach/Busoni, no Ravel, no Ligeti, no Schoenberg)
(and some minor things, Like WTC fugue 5 and 6, Liszt Chasse Neige, Harmonies Du Soir and Vision etc)