I have the Brautigam set, and it's wonderful (be sure to get the complete box shown by Mike, which includes the variations--there are also separate BIS Brautigam boxes of just the sonatas OR the variations). But Brautigam uses a fortepiano which, although authentic, is not to everyone's taste. I also have Uchida's set, and recommend it--she has a nice touch with Mozart (although others, e.g., clem, may disagree).