Any of these will do:
Mozart: #s9, 21, 23- all are around 30mins.
Mendelssohn: #2 in D minor (my grandma plays this, she said it isn't to difficult)
Beethoven: #s 1-3 In #3, the 2nd movement is wow!

Haydn: The D Major
If you want something better, more famous, a little( but not too much) more challenging a little more exciting, or more energetic, try these (But I suggest DON'T TRY IT YET):
Mozart: #s24, 26 (These are one of the most famous, but not as famous as #21)
Tchaikovsky: #1- the shortest of the 3- around 38 mins.
Beethoven: #5
Schumann Piano Concerto in A minor
Kabalevsky: #3
Shostakovich: #2 in F- The easier of the 2. Be careful at the 3rd movement- some parts have an odd time signature- 7/8.
Chopin: #2- 2-parts Piano Sonata, 1-part Piano Concerto, but it's still a concerto.
But don't try the other concertos- they're extremely long and really difficult to play.
These are just my suggestions, since my hands can stretch up to 10 keys, loves banging and loud, massive chords and octaves (Chopin's Polonaise is full of them), incredible leaps(like Chopin's Etude 25/4), stretches and gaps (like Chopin's Etude 10/1), odd fingering and espcially loves manoeuvring through the black keys.