Reddit reviews Chopin: 24 Préludes, Op.28

Vladimir Horowitz's Chopin can be controversial, but this collection is widely accepted as being among his best (from what I've seen, at least) and is a personal favorite.

For the nocturnes, I'd go with Rubinstein, and he also had very good recordings of the waltzes. For Chopin, it's hard to go wrong with Rubinstein - his 11 disc Chopin Collection is a pretty essential collection and is one of the best overviews of Chopin's music.

I personally like Maurizio Pollini for the preludes, but there are some who think that his interpretation lacks emotion (I'd obviously disagree completely). His interpretation of the etudes is unmatched, I think.

EDIT: I'd also like to add a recommendation for Vladimir Ashkenazy, who interprets Chopin very intelligently, as well as Ivo Pogorelich (though the latter could be inconsistent throughout his career and his playing was very controversial and unconventional).

Here are some to get you started. Unsystematically selective, and didn't include opera.

Beethoven String Quartets by the Tokyo String Quartet- Razumovsky and late Quartets.

Brahms and Schumann Piano Quintets.

Schubert String Quintet and Trout Quintet.

Berlioz Symphonie Fantastique and Requiem.

Chopin Ballades/Scherzos, Nocturnes, and the op. 28 preludes.

Dvorak Cello Concerto.

Mendelssohn orchestral works.

Wagner overtures/preludes.

Schumann symphonies.

Wolf Lieder.

Schubert Winterreise, Die schoene Muellerin, and Lieder.