I always liked the comic-book adaptations of Bradbury's short stories; originally done by Topps Comics, I think. Really nice stuff that used various art styles to match the mood of each adaptation. Atmospheric and fitting.
I think some of them were reprinted and collected as a graphic novel trade paperback by iBooks awhile ago, which is how I managed to read them via the library.
Er. Hard SF recs. I always liked
Joan D. Vinge (used to be married to Vernor, whose last name I have found out via Robert J. Sawyer's
WWW: Watch novel is actually pronounced "vin-jee" and I've been mangling it all along). Not strictly hard, but definitely mostly hard-ish. Plenty of scientifically-grounded tech and space exploration to go with the social consequences thereof.
World's End is more-or-less standalone (though part of the award-winning Tiamat cycle) and the hardest of the lot, I think. She's also got
Heaven Belt Chronicles which though probably less easy to find, may be even more so.