When listening to Mozart's solo piano sonatas: who are the artists to know?

For my money, you already have one of the best sets. Although I know she isn't to everyone's liking, it's hard for me to think of a set that's consistently better than Uchida's. Rather, some pianists shine in certain sonatas but few excel in all of them. The other sets that come to mind as being very consistent are Badura-Skoda's and Eschenbach's.