Class 3 KENDOR RECITAL SOLOS is fantastic. Its a book of class 3's that your kids will enjoy. You can also get the same book for almost every other instrument. also: Kendor First Solo Album For Horn Allerseelen - Strauss/Voxman Autumn Dream - Lotzenheiser
These are all on the easier end of their respective lists. Of course all of the Dishinger arrangements are library staples, but personally my kids think they are a little "boring."
Class 3: The Kendor Recital Solos book. It has 10 Class 3 solos. The Hunt - Ployhar Rigaudon (from Pieces de Clavecin, 1724) - Rameau/Dishinger Gavotte (from Harpsicord Suite No. 5) - Boyce/Vedeski
Class 2: Hornpipe - Handel/Ployhar Celebration for Horn and Piano - Eveland Allegro from Concerto Grosso, Op. 3, No. 4 - Handel/Dishinger Gavotte in Rondeau - Lully/Post From the book Solo Sounds for French Horn, Levels 3-5, Vol. 1: - Andromeda Serenade - Beethoven/Poole - Hornpiper's Dance - Forsberg/Johnson - Melodies from "Der Freischutz" - Weber/Ployher - Alleluia from Exultate, Jubilate - Mozart/Ployhar