A lot has been said already.
100% by Paul Pope is quite unusual and short too, dystopian future where instead of simply watching girls strip they have sensors which allow you to view their internal organs. It's poignant, not gratuitous and it's merely a fraction of the story.
Looks like this:

Hard Boiled by Frank Miller is great, as is Sin City and his Batman series. Akira is essential. I don't care what semantic piffle has been written about Manga; read some. Alan Moore is obviously a comic veteran too.
I quite like Monkey vs Robot for something different. Check out your local library, they usually have a section.