I rarely listen classical music nowadays, but my very slim CD collection consists of:
J S Bach, Brandenburg Concertos
J S Bach, Suites for Solo Cello
Debussy, Piano Works
Ravel, Piano Works
Bartok, String Quartets
Bartok, Mikrokosmos (piano)
In my equally slim vinyl collection I find:
Debussy and Ravel, String Quartets
Stravinsky, Firebird/Petrushka
Stravinsky, Rite of Spring
Stravinsky, Soldier's Tale
Bartok, Music for Strings, Percussion and Celeste/Hindemith, Mathis der Maler
I think these are typical tastes for someone whose first love is modern jazz. Many years ago I heard Ronnie Scott on "Desert Island Discs" and a number of his choices coincided with mine, that is, after he'd chosen the up-and-coming tenorman, Joe Henderson - which tells you just how long ago it was!
Recently, though, I've been branching out by listening to Steve Reich, particularly Six Marimbas and Different Trains.