The Crazies is a fantastic film, very dark, very cynical. They're actually remaking that one and, like 'Dawn', they'll probably ignorantly miss Romero's message in favor of blatant carnage.
One fantastic lesser known work of horror by a big-name director is Cronenberg's The Brood. It's very moody, wicked weird and has intense theories about the psychological effects of divorce and other parental problems on children. I highly recommend this one.
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