In terms of quality, the only essential films fall within the 1934 - 1952 Columbia run. After 1952 they made "for fans only" shorts (OK, maybe GOOF ON THE ROOF qualifies as essential). The Derita features are fun little excursions, but hardly their best stuff. The Healy's are curios. KOOK'S TOUR is like watching paint dry and is for historical purposes only. I have a soft spot of SOUP TO NUTS, but then again, I'm a hardcore fan. Take a few dozen shorts from the 1934 - 1952 run (opinions on those will vary), and you have all the essential Three Stooges films.