I OD'd on him last year and have only read "Confessions Of A Crap Artist" this year - one of his non-sci-fi ones (though he manages to throw in a suburban UFO doomsday cult) and that also features the evil PKD woman archetype, screwing over her husband, brother and the married man she seduces. Calculating and scheming, but also like some childish but lethal force of nature. It's not a terrible book, and has some cool lines, but I wouldn't recommend it unless you've read most of his other stuff.This is really noticeable in 'Valis'; Gloria, Beth and Sherri are basically all depicted as evil and trying to destroy everyone around them. He even describes Sherri as the antichrist at one point.
Ubik, Martian Time Slip and Flow My Tears... are my personal faves, in as much as I actually had semi-psychedelic experiences reading them (though I'd suggest ripping out Flow My Tears...' epilogue, which is totally godawful and pointless, and was probably forced by the publisher). I'd like to get back in a PKD groove for a bit, how was Valis, Version? Might try that next.