a really virtuosic piece probably wouldn't be possible in that period of time -- for me at least, i don't know about you boliver. I would suggest that you look into Debussy's
Prelude (from Suite Bergamasque). It is certainly attainable in four weeks if you practice right. Some nice fingery passages and some good chords too.
10/12 - if you play that, it will be impressive certainly. very technically demanding and with great chords and velocity. but the left hand must be clean enough to take a dictation from! or else it's no good (i made the mistake of trying to resurrect it for an audition and it didn't turn out so well...i had more time than you too, but still wasnt enuf.)
10/9 - definitely difficult, although not as demanding as the revolutionary.
depending on what kind of audition it is, though...if it's for school they're more concerned about technique and hitting the right notes, as opposed to a contest or entrance audition they would be more interested in virtuosity.
another thought - 1st mvmnt
Sonata Pathetique, Beethoven. short but sweet
also:
well what about chopin's first waltz? I thought I was learning it pretty good, but my teacher thought it was above me so I put it aside. what if I learned the crap out of it and played it for him in the fall? would that be too big of a gamble? would I possibly run into the problem of wasting my time because my teacher will just say again to put it aside?
If you learn it well, your teacher won't tell you to put it aside! he/she will be impressed probably and want to spend more time on it. (or, the teach doesn't even have to know!)