I've come to really like the early novels, and ESPECIALLY the NONscience fiction that PKD produced in the fifties and early sixties.
Some of his more fantastic material really seem to be quite topical right now in this Bush-world, such as The Zap Gun and Lies, Inc (and in its own way Clans of the Alphane Moon!). The short stories are AMAZING in the way that they are such concentrated ideapacked constructions, but the downside for me is that the characters and their development--possibly my favorite aspect of the work--are given short shrift.
Later material is very interesting too as like Jeff I've weathered some of the issues and scenarios. . . . I see that someone intends to make a movie from "Flow My Tears the Policeman Said" which would could be one Bush-world rocking movie. . . !