Accelerando is a good book. I think it's fair to say it's part cyberpunk, but it is less oppressively dystopian, it is more deep time, and more fun. Compared, of course, to what I have experienced as cyberpunk.

It touches on a lot of deep questions, but either doesn't delve deeply into them, or sort of does, but doesn't force any answers on you. And, unlike a lot of similarly "grand questions" fiction (I'm looking at you, early Neal Stephenson novels), it has a satisfying ending.