Whenever I'm at a party and someone discovers that I'm a mystery writer, the question that always comes up -- after "Should I have heard of you?" and "Where do you get your ideas?" and "Can you really make a living writing that crap?" -- is, "What other authors do you like?"
It's hard to answer that, as I read widely and indiscriminately, and I'm inordinately fond of several writers that I could not possibly recommend to you unless I was pretty sure that your taste was as cosmopolitan (read "odd" or "strange")as mine. John Kendrick Bangs comes to mind, as does Harry Stephen Keeler.
I guess I'll start with a list of mystery and suspense authors I can recommend, with maybe one or two science fiction authors thrown in. As I discover their web addresses, for those who have web addresses, or web addresses devoted to their works. I'll insert them.