I believe this is the (rough) order of difficulty:
- Petzold – Minuet in G Major
- Beach – Gavotte
- Starer – Silver and Gold (a 12-tone piece); Grey is also 12-tone, but I like this one better.
- Bach – Two-part Invention, No. 1 (C Major)
- Chopin – Prelude In A Major, Op. 28, No. 7
This will keep me busy for a while!