Hi, I'm playing the Chopin Ballade in G minor right now (in the midst of learning :p) and I just ordered the book of his 24 preludes... I've browsed through them at random before, just wanted to know if his 'tougher' ones, namely the Bb minor and such, are on par with the G minor ballade? I want to learn the really impressive, short preludes, but really dunno what they're on a level with...