Recommend Classical Piano LP's

Alfred Cortot playing Chopin's fourteen waltzes.
It was originally put out by Angel in 1957 on their Great Recordings of the Century series, with a nice booklet as well. These are from a 1934 original recording so the sound is not up to current standards but the playing is unrivalled in my opinion. It was later redone by Seraphim sometime after his death in 1962.

Beethoven Sonatas performed by Vladimir Horowitz (Columbia Masterworks), if you can find it.

For your specific purpose (chilling out after work), I second the Rubenstein Chopin Nocturnes with (almost) a money-back guarantee.

Debussy is another excellent place to go. Anything by Arrau on Phillips (fine recordings), Paul Jacobs on Nonesuch, Michelini on DG.

A lessor known treat is Reinbert de Leeuw doing Satie on Phillips. Superb sound. Some people don't like de Leeuw's Satie because he plays very slowly (and this is also only early Satie, though it's some of the best Satie). I find it hypnotic. Available on 3 individual Lps or in a box.

Charles Koechlin's Les Heures Persanes (The Persian Hours) is one of the great lesser-known piano masterworks, in an hypnotic, almost hallucinatory vein, brilliantly played by Herbert Henck and stunning recorded by Wergo. For me, this was a "must-have" when I got back into vinyl a year or so ago.

I love this kind of stuff, and the list goes on. I found all of these, sooner or later, on Ebay or via Irvmusic.com.

Good luck, and enjoy. Should lead to many hours of listening pleasure.

Its not piano, but down the Satie road, "Sketches of Satie" by Steve Hackett is great to mellow to and very hypnotic as well. Hackett used to play guitar for the progressive rock group Genesis back in their 70's heyday and is a very accomplished classical guitarist as well. He plays acoustic guitar and his brother John plays flute in this recording. Highly recommended.

The one I keep pulling out is the Phillips recording of Claudio Arrau of the Chopin Nocturnes. I've got the Rubenstein on CD, and love the sound and performances of Arrau. Don't know about availability though.