In terms of graphic novels don't sleep on "The Preacher". The mix of story, graphics and word is beyond anything done 'til now.
With no margin for doubt at all.
I think they will make a movie out of it soon.
Also Tank Girl (by the guy who designed Gorillaz) is very fun reading with awesome, gritty graphics.
My first post y'all.
Jus to drop some 'not so mainstream, not so heroish comics.