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I'm a huge fan of his, I wouldn't let The Man In The High Castle put you off, I feel like it maybe just hasn't aged that well. Do Androids Dream of Electric Sheep and A Scanner Darkly are both good starting points if you wanted to try anything else by him. He's written some great stuff, ranging from quite accessible but well thought out sci-fi to gibbering, esoteric, nightmarish ramblings.
Have you read much else by PKD? His writing style is pretty different from book to book. One of the things I'm struggling with in The Man In The High Castle is that a lot of the dialogue and internal monologues are written almost like broken English, a bit like a dodgy impression of a Japanese person which feels slightly off.