I read A Scanner Darkly and loved it.
I find Philip K. Dick hard to read sometimes because his style is a bit inaccessible (took me a long time to get into books like Confessions of a Crap Artist).
My parents are both books nuts so that the house I grew up in looks like a library. Because my dad mostly likes SF every once in a while he'd pull a book out of the shelves and tell me I should read it. He got me interested in Philip K. Dick, Kurt Vonnegut, Stephen R. Donaldson (Gap Cycle, Thomas Covenant), Walter M. Miller Jr (A Canticle for Leibowitz), Isaac Asimov et al.