All my life I've tried to have the aha classical moment. Has never happened, with one exception: Gorecki #3. I own four versions. I find it profound. I own ten records by others, I try each annually to see if I'll warm up to them. One other contender maybe: Saint-Saens #3.To scott_w. You said you liked Gorecki #3. It is a musically unique and very profound work whose subject is death and torture. In terms of subject matter you might try a group of songs by Mahler: Kindertotenlieder, songs on the death of children. It is very haunting and profoundly sad. I like the version by Janet Baker, Leonard Bernstein, and the Israel Philharmonic.
Anyhoo - I'll keep eye on this thread for ideas.
It was interesting to me that your other favorite was Saint Saens #3. Your might call this absolute music without a theme. It is a sonic spectacular show piece, but not profound in the way the Goredki is.