Claudio Arrau is my favorite. You can listen to him here :
I like the old masters Kempff, Schnabel, Wilhelm Backhaus, Solomon, Rudolph Serkin, Emil Gilels, Myra Hess, Stephen Kovacevich.
I like also some more obscure pianists : Annie Fischer, Yves Nat, John Lill, Anton Kuerti, Louis Lortie. Theirs recordings are sometimes hard to find, but there are wonderful.