What to play next...

[bachbyte]

I am 14 years old, and I did my Grade 7 exam in March 2010 and got a distinction, but my teacher has decided I should do my Garde 8 in Autumn of 2011, which is quite a long way away, so in the meantime I'm trying to broaden my repetoire. Does anyone have any suggestions of some good pieces to try of a Grade 8 and above standard? I am currently playing a Beethoven sonata, Bach inventions and the 1st Debussy arabesque (I have already done the second), does anyone have any suggestions of really good pieces? Thanks