Just realized that I forgot to mention Frank Miller's RONIN, which for me trumps even his DARK KNIGHT RETURNS. Very sci-fi, very cutting edge, and very much a tribute to LONE WOLF AND CUB (which I should also have listed -- seminal, great material). This is the Miller work I would most like to see translated to the big screen, now that special effects could keep up with his apocalyptic view of the future.