This topic makes me sad. When I moved back to Spain from the US, I had to leave all my comics behind. :(

The Sandman is also my favorite comic ever. Aw, I had that gorgeus (and expensive) Absolute Edition. Oh well. I am surprised that it is so popular, given that it is quite literary. I don't think there is anything quite like it. It's so unique.

I also recommend Alan Moore (the author of Watchmen and V for Vendetta). When I was a teenager, I used to enjoy Christ Claremont's X-Men.

Frank MIller's Batman: The Dark Knight Returns is another classic.

And, of course, Asterix!

Valerian and Laureline.

V for Vendetta
Ys: the Last Man
Preacher
100 Bullets

Try Wasteland, The Walking Dead, League of Extraordinary Gentleman, and Maus.

Since you brought up Garth Enis (The Preacher), one must try The Boys (if one has a strong stomach, that is). Also "Y The Last Man" is good up until the terrible ending, so is Fables, and... hmm, I think I have a couple more, but I'd have to check. Ah yes! One of the ones I forgot!
Wow, I had no idea they'd done that. I read those ages ago. Elf sex...

Bone
B.P.R.D. (a Hellboy spinoff which is way better than the main series)
The Books of Magic
Vampire Boy
Black Hole
Locke & Key
Ex Machina

And of course several of the comics that were already mentioned in this thread e.g. Y - The Last Man, Sandman, Transmetropolitan, V for Vendetta, Fables and Preacher.

transmetropolitan by warren ellis, you'll love it

Oh, Fables is awesome! Totally forgot about that. Read them years ago.

I could never get into Y: The Last Man. Find it kind of obnoxious, actually.

The ending certainly was.

As for Fables, "Oh this is the Jabberwocky Sword, snicker-snack and all that."

"In that case you might want to take it off your shoulder, it has a tendency to want to cut through necks."

Okay, paraphrased, but yeah. Also, the identity of The Enemy is... amazing. They really did an amazing job on that one.

Star wars : Crimson Empire were my favies

If my memory doesn't fail me, I've only read one or two comics (except that monthly kid stuff that kids read when they're kids). The one I remember is Transmetropolitan and I think it was a guddun. So check it out.

I agree with most of the ones already mentioned.

I just reread some Transmetropolitan. Gotta love Warren Ellis. I'm pretty sure he is insane. I am not too sure if I found it actually good or just entertaining, but I also liked his Freak Angels stuff.

Oh and Casanova by Matt Fraction. That one was just pure win.

Also I forgot this one, but Alan's Moore's Swampthing. It is the greatest thing ever.

I never actually made it that far, which sounds like it was probably a good thing. :P I really tried, but it just didn't do it for me.

Man, I know it. Now I really want to read them again. I must have read that series when I was like, 13.

If you like your comics expertly and realistically drawn, hopelessly romantic and featuring lots of beautiful women, check out Hal Foster's (and I mean Foster's, not his successors') Prince Valiant.