Here are 11 works/recordings that I enjoy (no reps/warranties made about the recordings, they're just what I happen to own for whatever reasons). Bach is definitely my favorite. I listen to very little orchestral music, but like opera. Obviously much great and worthy stuff had to be omitted.
Bach, sonatas/partitas for solo violin (Podger / Channel Classics, Grumiaux / Philips, Szeryng / DG)
Bach, solo cello suites (Bylsma 1 / Philips)
Bach, keyboard partitas (Schepkin on piano / Ongaku)
Bach, Goldberg Variations (Hantai / Op. 111 on hpschd, Tipo / EMI, Schepkin / Ongaku on piano)
Wagner, Parsifal (Kna 1962 / Philips)
Beethoven piano sonatas (Kempff mono / DG, Yves Nat / EMI)
Beethoven string quartets (I have the old Vegh set on Valois)
Mozart violin sonatas with Grumiaux and Haskil on Philips
Borodin string quartets # 1 and 2 with Tchaikovsky's Souvenir de Florence (Borodin Quartet on EMI)
Haydn string quartets op. 64 (Quatuor Mosaiques on Naive)
Tchaikovsky Symphonies 4-6 (Mravinsky / DG) - had to expand to 11 because I couldn't stand to leave this out.