I'm compiling a list of "essential" comics. High quality stuff.
It is however, somewhat difficult to keep track of every comic I've read, so please help me out here and add what you would like to have in your essential comics collection. Preferably stuff beyond the obvious collections such as all of the Iron Man comics, Thor, Superman, etc.
Here's the list alphabetically;
100 bullets
American Vampire
Andy Diggle's Rat Catcher
Animal Man
Annihilation (with tie ins + conquest)
Fables
Flex Mentallo
Ghost Rider (new runs)
Harbinger
Hellblazer
Locke and Key
Lovecraft Tales (++)
Loveless
Northlanders
Scalped
Sandman
Sweet Tooth
The Invisibles
The Losers
The Sword
The Unwritten
TMNT (even the terrible stuff)
Uncanny X-Force
Y - The Last Man
Ed Brubaker's Captain America run
Captain Marvel (Mar-Vell)
Justice Society of America
Books of Doom
Immortal Iron Fist
Daredevil (way too many great runs to list, tbh)
Marvel Zombies(original)
The Walking Dead
Secret Wars I
Planetary
Punisher MAX
Godland
Lucifer
Iron Fist(Fraction/Brubaker)
Batman: Year One
Grendel: Devil By The Deed
All-Star Superman
Annihilation
Sinestro Corps War
__________________
"I am tired of Earth. These people.
I am tired of being caught in the tangle of their lives."
Superman: The Journey
Flash: Rogue War
Batman: Hush
Astonishing X-Men
Essential X-Factor volumes 1-2
Daredevil: The Man Without Fear
Annihilation
Sinestro Corps War
Our Worlds At War
Aquaman: Time and Tide
Aquaman: The Trench
Justice League: The Tornado's Path
JLA: Earth 2
JLA: World War 3
Spider-Man: Marvel Knights
Good luck forming a list on such a public forum. You'll be collecting comics for decades. Anyway, here's my two cents...
I'm listing only "seminal" stuff that I know about and enjoyed. Anything that's too character-specific, I either list separately or leave out.
Watchmen
V for Vendetta
Secret Wars
Infinity Gauntlet
Crisis on Infinite Earths
Infinity Crisis
Final Crisis (though it was kinda crap)
Transmetropolitan
Planetary
Sandman (Gaiman)
Kingdom Come
Earth X / Universe X / Paradise X
Alan Moore's Swamp Thing
Batman Titles - Year One, Long Halloween, Killing Joke, The Dark Knight, Dark Knight Returns
Spider-Man - Maximum Carnage
JSA - between original crisis and Flashpoint - a personal plug...it ran for years and really didn't ever lag in quality, which is insanely rare for so long a stretch.