Take a look at Beethoven's Sonata op. 49 no. 2. It seems like it may be a good level for you now, but possibly a little challenging. Also take a look at some of Chopin's easier Mazurkas, Bach's Inventions, and Clementi's Sonatinas.
Alright, I've chosen to learn K.545 (Sonata 16), I will post a video when I've learned the first page!