For Bach, I'd definitely check out the C#minor Prelude and Fugue from Book I of WTC. It's beautiful, very polyphonic - a triple fugue in five voices - slow, and builds to a fantastic conclusion as all the subjects come together near the end. The prelude is also haunting and lovely.
I also agree, those are really good choices, but I also like the one in B-flat minor, because the prelude is just absolutely haunting, and you can do so many things with it, and the fugue is fantastic too, since it is in 5 voices. Also, to fill in 10 minutes of time to go along with the Dante Sonata, I was thinking maybe some Ravel, like the Alborada del Gracioso or Une barque sur l'Ocean from the Miroirs suite, but it's your choice to choose.
Ah! Ravel is perfect, however ive not studied any ravel. I will probably pick Une barque sur l'Ocean or one of the other Miroirs. Thank you for this reccomendation because i completley forgot about ravel!
No problem! Once you learn those pieces, you should make a recording and post them in the audition room, since you can get feedback there.