For a long time, the Moss SW trilogy set was my favorite, most-desired poster art. But I don't know... enough years have passed, enough other poster art has come and gone... I still think they're cool, but not the greatest ever. Especially the Boba Fett. I don't think it's what I'd choose for steelbooks.
Whalen's art, on the other hand, though it has a consistent look that is right on the verge of too-much-sameness, I just continue to love. Of the ones you posted,
@virkia, especially Incredibles, Alice, Robin Hood, and Lion King. I won't clutter things up with more links, but I love his recent Wall-E poster, and his Toy Story from a few years ago. A run of Whalen steelbooks with that consistency--I know it wouldn't please everyone, but I would love it.