I must say I usually pay more attention to the drawings than to the story, with few exceptions (marked with "S"). So my recommendations are supposed to be mainly for artists.
My favourites list (no particular order):
- Vagabond by Takehiko Inoue.
- Death Note by Tsugumi Ohba and Takeshi Obata. (S, my favourite script so far).
- Blade of the Inmortal by Hiroaki Samura.
- Rookies by Masanori Morita.
- Akira by Katsuhiro Otomo.
- Asterix by Goscinny & Uderzo.
- Shanna the She-Devil by Frank Cho.
- Anything drawn by García-López, especially Twilight, Batman Confidential: King Tut's tomb and Batman 66 The Lost Episode.
- Wonder Woman Earth One by Morrison & Paquette.
- Batman The Killing Joke by Moore, Bolland.
- Preacher by Garth Ennis and Steve Dillon. (S)
- Watchmen by Moore and Gibbons. (S)
So my list is mostly focused on art, so I must add that I love and recommend the work of Buscema (mainly on Conan) and Brian Stelfreeze. There are many artists more that I like, but I tried to limit this list to good storytellers (at least in my opinion).