I collect a boatload of postwar stuff. In baseball:
--1948 Leaf stars
--1952 Topps stars
--1954 Topps stars
--various Bell and Morrell Dodgers.
--various Koufax cards
--1971-1980 Topps
--all postwar Exhibits
--various star cards I wanted to own as a kid but never managed to get: 1952 Topps J. Robinson, 1957 Mantle, etc.; a long and eclectic list.
I prefer all but the 1970s in collector grade--more bang for the buck. It's about more cards for me, not higher grade. Makes it more fun to hunt.
In boxing: Basically everything but especially
--all postwar Exhibits
--1948 Leaf misprint, miscuts, blank backs
--1990s boxing cards autographed--mostly in person at the HOF shows.
Other Stuff:
--1976 Star Trek
--1970s Kung Fu
--1965 and 1966 James Bond
--1966 Fleer Good Guys and Bad Guys
--Various entertainment (Star Trek TOS, Star Trek 2009, The Mummy, X Men, etc.) certified autographs
--Academy Awards tickets