Too may horror movies to list...
Honestly though, as much as I love Friday the 13th, I have to go with "Halloween" (John Carpenters - not that Rob Zombie dreck) being the best Halloween movie.
Halloween 3: Season of the Witch is a GREAT Halloween movie too. It's really a shame it got lumped into the Halloween series, it would have gone down as a Classic Horror movie if it had to be a stand alone film.
SILVER SHAMROCK!!!
Cheers!
-Ian