I played classical piano from about 4 years old until I was 21. Towards the end I was really interested in modern classical. Of course I still had college professors making me play the Beethoven and such but my favorite two pieces I ever played were Charles Ives' "The Alcotts" from Sonata No. 2, and the complete Ginastera Sonata for Piano. Another real favorite of mine from the high school years was Lizst's Spozalizio from the italian pilgramage. Chopin's Polonaise in C minor got me pretty far in a Bob Jones high school piano competition (Yes that Bob Jones, I had a strange childhood.)
The last time I played for an audience and probably the last time I played a real piano (a 9 foot steinway) was when I performed the Ginastera Sonata at my community college. That is one amazingly insane piece to say the least, and I don't think my audience was up to the task of listening to it but I had a lot of fun. Something very cool about a piece where nobody knows if you're hitting wrong notes. I kind of got this crazy inspiration to stretch a few passages out completely irrelevant to the tempo I'd established and they ended up being the crowd pleasers, something to kind of break up the monotonous eighth note barrage. My teacher had kept telling me to find the melody in all that mess and it wasn't until I really performed it that the melody jumped out, so I made sure everyone knew it was in there somewhere. It wasn't until afterwards that I got Hilda Somer's recording of the piece and found that she does the same thing in a few places. I thought my teacher was going to kill me when I got off stage but he was impressed.
Ok sounds like I'm bragging here about being really good, but I wasn't. I basically got to a stage where it would have taken a large part of my day practicing to really get better. I was sort of at a high school level of real understanding of the music and technique, while constantly tackling harder pieces, and actually overstressed my hands and arms a few times because I was so haphazard with the big pieces I was playing. I stopped playing classical because I was no longer interested in the same old Bach & Beethoven, and didn't want to become a master level pianist (and definitely end up teaching somewhere, I'm definitely not cut out to be a concert pianist).
So, all that ranting aside, basically all I do now is screw around with jazz & blues on my keyboard. Still satisfying although I wish I had a real piano to keep my fingers more nimble, a keyboard just doesn't give the same kind of exercise.