Roastie, I suggest the pieces based on whatever knowledge I have of your level of playing. For your information, I don't think Solfigietto is difficult either, it is just a bunch of scale runs grouped together , in fact according to a pedagogy book I have, Solfigietto is ranked lower in terms of difficulty compared to the pieces I have listed above.
Do not fall into temptation of choosing overly difficult pieces just for the sake of playing a difficult piece or impressing judges. A lot of pianists, including some from this forum, seem to have this misconception that the more difficult and virtousic the pieces are, the judges at competitions and auditions will be more impressed. Throw this extremely flawed thinking out of your mind. Instead ,choose pieces that are comfortable for your technical level and one that allow you to demonstrate your musicality worthy of your level. A intermediate piece played well will be music to the judges, remember, you are playing for qualified and experienced musicians, they are looking for music, not some fancy fireworks.
I can suggest you advance pieces, but I would not in the best interest of you. Anyway, you only have one month and one week to prepare a piece, you will not want to choose difficult pieces to prepare, that would be a suicide.