Sci Fi For Children Who Can't Read Good.

I'm not a man of broad vocabulary. I never really did well in English at high school [I left with an Intermediate 1]. However upon leaving high school I have begun to read more and more. However to regain my point; I'm not a great reader and was wonder what science fiction novels/novella etc would you recomend for a moderate reader such as myself? I've read the obvious citations such as Dune and Do Androids Dream Of Electric Sheep.

That gives me no hope for the rest of the books.