Please Recommend Audiophile Solo Piano Recordings

Although a couple of these have already been mentioned, they're among my favorite solo piano recordings:

Jazz:  Bill Evans - "The Solo Sessions, Vol. 1" (on vinyl) probably my favorite for relaxing life-like piano
+1 for Herbie Hancock, Piano
Michel Camilo - "Solo"

Classical: Mieczyslaw Horszowski - "Piano Sonatas" (well recorded CD)
Frederic Chopin -  "Complete Nocturnes & Impromptus" CD  

Doubt it's on download, but the VAI CDs of Moravec playing Chopin (originally Connoisseur Society recordings) are uniformly excellent, sonically and artistically.  I'll also second the Nojima recordings mentioned above by Newbee.

The Stereophile recordings with Robert Silverman are all very well recorded. I'm not a huge fan of his playing style but the piano sounds very true to my ears. Another favorite for both sound and performance is Uchida's live Mozart recording from the early 90s--very creamy and realistic piano tone and phenomenal artistry. Simone Dinerstein's Goldbergs are pretty well done as well. And I second the Moravec Chopin which was released as a two CD set and sounds pretty darn good but the playing is superb.

Now that Herbie Hancock and Bill Evans got mentioned, let me add Keith Jarrett. Unusual and unique style, his "The Kohln Concert" (ECM 1064/65) was the recording of the month at Stereophile mag, and as any other ECM offering it is definitely "audiophile" quality!!! Obsessing with Audiophilia: Silverman at Stereophile label got mentioned, let me add Alan Gambel "Chopin and Liszt Piano Sonatas" on Mapleshade, CD 07382. I spent quite a few bucks on Mapleshade hardware after listening to their CDs! Unique sound, I daresay even better than Naim and Linn offerings.
My understanding is that you are trying to "voice" your rig. Thats how I do it also, on solo piano.
XRCDs beat SACDs in my room. Get "Emil Gilels - Beethoven: Sonaten" here:  http://store.acousticsounds.com/d/96344/Emil_Gilels-Beethoven_Sonaten-K2_HD_CD
or Richter here:
https://www.amazon.com/Beethoven-Appassionata-Funeral-March-Sonatas/dp/B00024I3C6
"Highest Standard of performance" is a bit too subjective: Richter playing makes me cry, Rubinstein or Horowitz kick me into a different realm. Check out "Steinway Legends" on Amazon and choose your poison! Downloadable at http://www.prestoclassical.co.uk but usually its cheaper to buy off Amazon and rip.

Bulgarian Piano Blues - Milcho Leviev. 1990 M.A Recordings. plays a Boesendorfer Imperial 290.