Not entirely sure yet, see, i only bought the book today! But, I do quite like the Giga, (A1) though i'm not sure how i'd feel about practicing it for months on end!
The Beethoven (A2) also seems quite nice - a little harder, though. Having only got it today i haven't braved sightreading the Polonaise and the only B piece i've tried is the Schumann which i already had - i quite liked it.
C pieces, I think Willie Wagglestick seems quite fun (don't really like the other two) but the name puts me off

!
I don't have a lesson until the 17th or something, though, so i've gotta hope my teacher likes whatever i choose. however, I'm pretty sure she won't like the Beethoven. I'm swapping teacher in September, so i don't know how far i'll get, and I'm doing Cello gd 6 and Clair De Lune on the piano at the mo and jazz piano, and, and, and.....i'll shut up now.