dmat, I would recommend checking out the Spirit. Not sure if Dc is reprinting alot of these yet, but the character is really, in artistic terms, one of the top 5 superhero/masked-detective adventure characters in comics.
Eisner really broke alot of new ground that has not been equaled when he create those old Spirit comics. Good clean fun with a dose of film-noir-syle literacy thrown in for good measure. Not the greatest comics ever done, but certainly better than the majority of superhero comics. They were produced in an innovative format beginning in the 1940s --Eisner created the Spirit and a few other features and then packaged them as full-color newspaper inserts to compete with the Sunday funnies. The advantage being, where a great newspaper adventure strip like Capt. Easy, Flash Gordon, Terry and the Pirates, Orphan Annie or even Superman only had one page per week, the Spirit appeared in a full 5 or 10 page adventure every week --equivalent to a comic book adventure but free in the weekend paper, allowing for greater character development and breadth of story.
Looking for a place to start? Eisner's pre-WWII stories are pretty good, but his late-40s stories are best --mature superhero adventure and romance at its best. Single issue collections by various publishers from the 80s and 90s, including Kitchen Sink and Dark Horse, are plentiful and cheap --many issues contain 3 or 4 classic stories in full color.
Darwyn Cooke is a great superhero cartoonist but I can't see him improving much on those classic Will Eisner stories. Most people agree that, with the exception of some superhero parodies, a handful of those Spirit stories, along with a similar amount from CC Beck and Jack Cole (and of course the Superman family stories by Binder, Siegel, Boring and Swan
), amount to the best that was ever done with superheroes before they got all adult beginning in the 70s.
As a starting point, and for an overview of the case for and against Will Eisner's art, I recommend:
Chairman of the Board
http://www.tcj.com/267/e_groth.html