Shubertmaniac makes a good point. I've always liked Murray Perihia's CBS recording of the Schubert Impromptus, not for sonic reasons or necessarily for performance reasons, but because it is well-played and the first recording I ever heard of the piece, and I liked the music and kept listening to it. When I think of it, many of the performances of classical pieces I like best are the first ones I heard of them (for example, the Richter Rachmaninoff 2nd Piano Concerto, which is quite different than any other I've heard, and Rubenstein's performance of the Rhapsodies on a Theme of Paganini). Hasn't stopped me from listening to or enjoying other interpretations, fortunately, but the first ones are the ones I wind up comparing all others to.