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.