Debussy's Reverie was on teh Grade 8 syllabus a while ago, but its lovely...i would advise studying maybe Beethoven, one of the Debussy's you suggest, and the Joplin to get you studying different styles together, and heck..why not have a go at the Chopin aswell! It's a nice little set of pieces you have..there's a good progamme for a short concert there!