I absolutely agree with Sviatoslav Richter belonging on the list! Can't believe I did not think of him, since I have several of his recordings.
Interesting note on Bach and the piano. I stand corrected.
Oh, and I mention Van Cliburn partly because I thinks he deserves to be on the list. But he also comes to my mind because I got to meet him once, right after hearing an outstanding performance of the Grieg concerto. And it is hard to beat his recording of that one little tune by Tchaikovsky.