What scifi novels are you reading and who is you favorite author?

to start off im currently reading Cloud Atlas and A Scanner Darkley. two completely different aproches to science fiction. Cloud Atlas is about time and the impact that different individuals have on it. i wanted to read the novel before seeing the movie as the book explains the concepts better. A Scanner Darkley by Philip K Dick is about someone on slow d a drug that makes the user act very strange, the book is so well written you begin to wonder who is going mad the reader or the main character. i havent finished them yet so these descriptions may not be correct. favorite Scifi writters are Steve Perry, Douglas Adams and now Philip K Dick