LG, have you listened to any of Mahler's work? I saw you piece on Beethoven and the first thing that came to mind was "I'll bet he would dig Mahler". Mahler practically worshiped Beethoven and you can hear it in his music. I've got a link to a sharity blog that has a lot of his stuff for dl, if you haven't already discovered him.
Also, in my opinion, the most sublime "classical" music ever composed is the 3rd symphony of Henryk Gorecki's. I know this is your recommendation thread, but I had to mention it.