A Scanner Darkly is also quite excellent. PKD's short stories are worth a read as well.
He is the author for our present era. Cynical and conspiratorial stories set in a vaguely authoritarian dystopia.
I think his best work is his last, Radio Free Albemuth. And still so relevant:
In the late 1960's, a paranoid incompetent has schemed his way into the White House and convulsed America in a vicious war against imaginary internal enemies. A struggling science fiction writer named Philip K. Dick is trying to keep from becoming one of that war's casualties. And Dick's best friend, a record executive named Nicholas Brady, is receiving transmissions from an extraterrestrial entity that may also happen to be God - an entity that apparently wants him to overthrow the President.
his short stories are great, and are a great place to start. i read on the bus to and from work, and i particularly like reading pkd during these trips because the paranoia and insanity from his words seep into your brain and you start thinking that everyone around you is a simulacrum or that puddle of body fluid on the floor is actually telepathic slime mold.currently i'm reading dr. bloodmoney.
The 3 Stigmata... is the craziest fucking book I've ever read. Genius.
I vote for Valis.
You all are high "Flow my Tears, the Policeman Said" is not only his best novel but the best english language title EVER.
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