I'm working on Chopin's Etude op. 10 no. 1, with a goal of quarter=140
One thing I didn't know it helped with until I played it was getting more familiar with distances between notes without being able to eyeball them, just having to have your fingers spread a certain distance apart. I may try to learn to play this without looking, I think that would help too.
I'm also working to bring out the right hand melody since I haven't heard many recordings do that well.