I think a case can be made that those Bach works for solo violin (the sonatas and partitas) are the greatest pieces of pure unadulterated music ever put together by the human mind...and I'm a Beethoven nut.
I OD'd on Beethoven as a high schhol kid, and as a result haven't been able to listen to him regularly since then. Once every 5 years or so, I listen to the 5th symphony, the Emperor concerto, and the Violin concerto, just to admire the carpentry.
Your list is pretty good, though I might want to substitute:
Vivaldi's concerto for 2 harpsicords
Mozart's Don Giovanni,
Donizetti's L'elisir d'amore,
Handel's Giulio Cesare, Deborah,or Solomon
Sibelius's Violin Concerto in D (yeah, I know it's 1903. So sue me)
Wagner's Ring
Albinoni Oboe Concertos
Overall, in middle age, I find I can do without the 19th century Romantics. I wonder if I'll ever come back.