Okkk... I can play the full grieg sonata, but I am getting kinda tired of playing it, and want to play a beethoven sonata. Ppl have recommended the tempest, which they say is around the same difficulty technically as the Grieg. It'd be a good help if you could list any other beethoven sonatas around the same TECHINCAL difficulty as the grieg...
And also, I have been inspired to learn the Prok 3rd sonata... what well known pieces does it compare to, and is it more difficult than his tocatta, which I got a small chunk done, but could not get any further...