hey, that was very nice, very nicely put.
I agree with all of your choices, of course he didn't write much that was bad.
The Cello Sonatas - I have a recording of Pablo Casals playing them and you can hear him grunting - it's actually kind of nice. Op.69 - the 3rd sonata, is my faveorite, I think. I played that one a few years ago.
Anyway, I think your impression of the Moonlight Sonata is right on. He sort of was on the edge, despairing with his hearing loss....
Marleypumpkin posted the Heiligenstadt Testament not long ago on the old board - that seems to be right at the point when he comes back from the abyss.
Why the German? Are you German, or is Endlichkeit used in English sometimes, like Weltschmertz or Grundgestalt?