Hi Franz,
The study of piano is a lifetime endeavor that requires patience, methodical progress through practice, and over time an ever expanding repetoire and capability. So the route toward virtuosity is through a graded approach to selecting pieces. By graded, I mean "beginner, intermediate, and advanced" to use a simple breakdown.
As you know, a medical student would be ill advised to jump into brain surgery before he has learned how to take someone's blood pressure. It's the same principle in selecting piano repertoire. Before a pianist undertakes Ravel's Gaspard de le nuit, he might first play some of Ravel's short character pieces like Menuet Antique, Prelude pour Piano, and A la maniere de... Chabrier to get a flavor of the composer's idiom and style. Next, he might move on to the Valses nobles et sentimentales. Then he might learn Sonatine. From there it's on to Tombeau de Couperin, Miroirs, and Jeux d'Eau. Finally... and as the culmination comes the titanic struggle with Gaspard, a pinnacle of the literature. Different pianists might do the above progression slightly differently. But my point is that they don't start with Gaspard. Nor do they place it in the middle of the progression.
Unless you take a graded approach to study, you'll not only get ahead of yourself, but you'll short change yourself too. The reason is that your technique will not be on par with your aspirations. So not only will you not be developing properly as a musician and pianist, you won't be playing in an artisitic manner either. Then you'll have all the wrong habits to try to unlearn later. Again, we're talking about patience in learning an art--one that demands perfection in serving the composers. Recognize too that the sense and skill of interpretation comes only with increasing maturity. It is not at all present at the outset.
So my advice is to learn music that is clearly within your grasp. It is far better to play a piece at your proper level very well, than to make a mess of a difficult piece (which no listener will appreciate). Do "stretch" yourself every once in a while by learning a piece that is one step (but not 10 steps) above your current level. That helps you to progess more quickly too. But keep those stretches within reason. There was a famous pianist when I was your age--Wilhelm Backhaus. He had a saying: "If you want to gather a bouquet, you don't have to make it out of oak trees". And he was right! An artist is not made overnight.
So regarding the Beethoven Sonatas, I agree with JTownley--do Op. 49 for the time being.