pair the awesome Fantasia in C minor (K475) with sonata C minor (k 457), it serves as a sort of prelude to the sonata and are an effective combination when played together back to back (you get a large scale extended sonata, uncommon for classical period, also the C minor is unusual for mozart, he did not write many sonatas in minor, and the 457 in particular is very forward thinking in its construction, almost nodding to the pre romantic/bridge compositions we see later with Hummel, and the like...).
Best,
V