Peter, I also prefer Bach on piano. I do own a handful of harpsichord recordings, incl. Hantai's Goldberg Variations and Suzuki's Kunst der Fuge (the latter of which I really enjoy).
Don't have any Bach by Kempff, but his Beethoven sonata cycle is my favorite.
I have a bunch of Bach piano recordings. Listen to Sergey Schepkin the most. Other pianists include Feltsman, Schiff, Feinberg, Gould, Tipo and Martins, the latter two of whom are known for idiosyncratic interpretations (maybe Gould is in that category too, but he's much more respected 🙂).