My favorites are Tchaikovsky (Violin Concerto, Piano Concerto, Trio in A minor, Serenade Melancolique, Swan Lake etc. - probably my favorite overall in terms of depth), Brahms (Violin Concerto in D, Concerto for Violin and Cello, Trio in B, Piano Quartet in C Minor etc. - here would be the one competitor), Rachmaninov (Piano Concertos 2-4 are up there with anything for me), Debussy (La Mer, Fille Aux Cheveux de Lin, Reverie, Beau Soir, Clair de Lune, Sonata #3), Dvorak (Cello Concerto, American String Quartet, Humoresque)
A level below would be Sibelius (Concerto in D minor, Finlandia, 2nd and 5th Symphonies), Faure (his two quartets), Saint Saens (Havanaise, Introduction et Rondo Capriccioso, Carnaval des Animaux), Satie (Gnossienes, Ogives, Gymnopedies).
I guess I'm pretty much a sucker for Late Romantic.
Individual works: Wienawksi Violin Concerto 2, Bizet's Carmen (perhaps especially as Sarasate's fantasy), Lalo's Symphonie Espagnole, Glazunov's Violin Concerto in A minor, Prokofiev's Concerto #2, Mendelssohn's Violin Concerto, Chausson's Poeme, Franck's Sonata in A major, Schubert's Trio in B Flat, Rodrigo's Concerto de Aranjuez, Gershwin's Rhapsody in Blue, Massenet's Meditation from Thais, Monti's Czardas, Mahler's 5th Symphony, Sinding's Rustle of Spring (my grandmother's favorite piece - she played it perfectly until she was 90 years old when she couldn't remember anything else). A lot of this is influenced by pieces Heifetz played.
Of course I like Beethoven and Bach, but that does without saying. Although to tell you the truth, I can't say that I love a lot of Mozart, although that could be in large part due to hearing it too much.
The best part starts at 3:06
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