What are some good non-superhero comic books/graphic novels that you would recommend?

I just recently got into reading comic books because my preconception of them was that they were mainly for dudes and had little plot outside of meaningless violence and men in spandex. Not that I can't appreciate meaningless violence, but you know what I mean. My brother told me to read Watchmen and I fell in love with the political and philosophical undertones as well as all the metaphor and satire packed into it. So I started reading a few other comics that he recommended and I'm trying to broaden my horizons now that I know there is some really good **** out there.

Just so you know, I have already read Watchmen, Preacher, Y: The Last Man, The Walking Dead, The Exterminators, and American Virgin. I really liked all of them except American Virgin.

I plan to read Maus, Transmetropolitan, Love and Rockets, Young Liars, V For Vendetta, and Fear Agent. So anything other than those because I am already going to read them.

Sorry for the novel, but I thought maybe if I included all this stuff it would help answer my question.

Any answers would be great. I would prefer books with somewhat of a deeper meaning but good art or just entertaining stories would be good too. Thanks :D