What do I enjoy reading? Besides Christopher Hitchens (my favorite atheist writer), I like the usual Freethinkers: Dawkins, Harris, etc.
But when it comes to something less scientific or existential, I go with Patrick O'Brian (think movie "Master and Commander"), Oscar Wilde (master of satire), Shelley (read his atheistic writings), Keats (for wonderful poetry), Neil DeGrasse Tyson (for all things space), Hemingway, Woolf ("To the Lighthouse" is great), and, of course, I do like some Shakespeare (the boss) when I'm really in the literary mood.
Right now I'm reading Neil Tyson's "Death by Blackhole" and--when I have the time--Hitchens' "The Portable Atheist." (I still don't find it very portable, damn thing.)