This build pairs Spirit Barrage with the spirit theme of Rush of Essence to allow for spamming your abilities. Horrify with Frightening Aspect, Soul Harvest and Gruesome Feast provide significant boosts do your damage and defensive stats allowing you to get by with mediocre gear. You can use the version shown here for fast AoE clearing of the lower MP levels through Grave Injustice or swap in more traditional abilities like Zombie Bears and Acid Cloud for the higher MP levels.
Feedback and/or criticism is welcomed and appreciated as always :D
-----SPIRIT BARRAGE BUILD GUIDE
Build Calculator - http://us.battle.net/d3/en/calculator/witch-doctor#gZXUdQ!fYT!ZbYYcb
Gear Set - http://d3up.com/b/12377
You can find my channel at www.youtube.com/ProzaicMuze