Your favorite Comic/graphic novel of all time that you would highly recommend?

Hi, I've just recently started getting into Comic books as a medium (I'm trying to read more books and take smaller breaks from gaming & TV shows) and I want to see what your #1 all-time favorite Comic is, that way I can read them for myself, so I can build a personal collection of mine. Currently, my favorites are:

Planet Hulk

The Dark Knight Returns

Absolute Wonder Woman Vol 1 & 2

TMNT: The Last Ronin