I think they'll want something more substantial than the Khatchaturian. Check out Prokofiev's 2nd or 3rd Sonatas... the Toccata seems a little too intense compared to your other rep (it's a ridiculous piece; the right hand finger-work is akin to having to type two sentences at the same time with one hand on a computer keyboard, at 70wpm haha)
Have you played any Chopin etudes? If not, you'd probably owe it to yourself to look through some of them. Start with some of the easier ones, and just work your way up.
-Op 10 #5, Op 25 #1 or Op 25 #2
then
-Op 10 #8, Op 10 #12, Op 25 #5
etc. etc.
Or, Debussy/Liszt have some pretty sweet etudes too...
Do a few more Preludes and Fugues, then check out an English Suite or a Partita, or a Toccata. I know he has a group of p/f's that are pretty damn difficult, but if you work through a suite, it's a great [substantial] standalone work.
Mozart and Haydn have some good sonatas too... (I still think Beethoven's are the best though
) , so Haydn's late Eb major, or Mozart's K457
Topic: Conservatory Audition Repertoire