Here's the thing, Keith: not everything needs to be reimagined as a variation on Sin City. The Spirit certainly didn't need to be, and Buck Rogers certainly doesn't need to be. The movie The Spirit will doubtless be chock full of badassery, but it's not going to be Eisner's Spirit, and Eisner's Spirit deserves a lot more respect than Miller is giving it.
Frank Miller's Buck Rogers would go something like this:
AERIAL VIEW OF A FUTURISTIC CITY IN BLACK AND WHITE BUT MOSTLY GREY. IT IS RAINING, BECAUSE, COME ON, WHEN IS IT NOT EVER RAINING?
BUCK (voiceover): The future. The future is my whore.
SLOW ZOOM IN ON BUCK ROGERS, STANDING ON A ROOFTOP. EVERYONE ALWAYS STANDS ON ROOFTOPS.
BUCK (voiceover): The future is my mother and my whore all at the same time.
FAST ZOOM INTO A FULL BODY SHOT OF BUCK, BACKLIT AGAINST THE RAIN. HE IS A BLACK PROFILE EXCEPT FOR THE ANTENNA ON HIS HELMET, WHICH IS GLOWING RED.
BUCK (voiceover): There are some people who say I've got woman issues, but there's no law against fucking a whore. Who is also your mother. Not in the future. Not in *my* future.
CLOSE SHOT OF BUCK'S EYES AS HE SCANS THE STREETS BELOW.
BUCK (voiceover): And make no mistake, this is *my* future. But somewhere, there is crime. Crime against whores. Crime against mothers.
REVERSE SHOT, BUCK IN PROFILE AGAINST THE GRIM, GREY, GRITTY ALLEYS OF THE FUTURE.
Buck (voiceover): And I will **** that crime. I mean those whores. I mean my mother. I MEAN, I will stop that crime. Why? Because I'm motherfucking Buck Rogers.
HE LEAPS DOWN TEN STORIES, LANDING IN A CROUCH AND CRACKING THE PAVEMENT AS HE LANDS. OH, WHOOPS, HE'D PROBABLY HAVE A JETPACK OR SOMETHING, WOULDN'T HE. OH WELL, NOT USING IT JUST MAKES HIM MORE BADASS.
Buck (voiceover): And this is my future. Did I mention that?