Let's go with The Ruling Class for Best Sound.
Personally, I think once each of us has had a turn, then that year is over--some years there just aren't enough quality choices, really, or we just haven't seen enough (as it is, I'm stretching it a bit to put Mariangela Melato in Best Actress, but as I haven't seen Lady Sings the Blues or Sounder or some of the others named by y'all, I was stumped with this category).
"...it is the weak who are cruel, and...gentleness is only to be expected from the strong." - Leo Reston
"Cruelty might be very human, and it might be cultural, but it's not acceptable." - Jodie Foster