This is my main WD build which should get me through nightmare if not hell. It's a more survivalist build with mana and life leeching. Poison dart for bosses and elites, grasp for slows and damage increase, dogs for tanking/kiting, and the rest to increase the above.
http://us.battle.net/d3/en/calculator/witch-doctor#aZYidR!VaX!aaccca
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http://us.battle.net/d3/en/calculator/witch-doctor#aZYidR!VaX!aaccca
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http://us.battle.net/d3/en/calculator/witch-doctor#aZYidR!VaX!aaccca