Some of the best new sci-fi is in graphic novels (comics) now. "Y: the Last Man" for example.
Hayao Miyazaki (of Studio Ghibli fame) is another master of the format though he trends toward sci-fantasy more than not. Nausicaä of the Valley of the Wind is the most sci-fi of his stories, as well as being a legend in its own right.
In terms of novels, I do enjoy the classics (Asimov, Heinlein, Wells) and the Dragonriders series (at least until Anne stopped writing them) as well as her other scifi, and Dune (the book, not the series) is also a firm favourite.
All that said, I still think seasons 2-9 of Stargate SG-1 are some of the best sci-fi written in recent times. Farscape too even though it's even softer than Stargate. In a similar vein, I do love me some Firefly too, which, weirdly enough, is actually pretty damn hard sci-fi despite (or possibly because of) its being a Space Western.
Of the above I'd pick Stargate if I was to be consigned to a desert island with nothing else to watch. And not just because of Amanda Tapping, Claudia Black, Lexa Doig, Morena Baccarin, Teryl Rothery, or Vanessa Angel…