Inventions and Sinfonias BWV 772-801 Piano Solo (ed. Rudolf Steglich, fing. Hans-Martin Theopold) Henle Music Folios
This title has selections that range in difficulty from SMP Level 7-9.
About SMP Level 9 (Advanced)
All types of major, minor, diminished, and augmented chords spanning more than an octave. Extensive scale passages.