At the moment I am level 27 with 370 damage.

Here is the build I have been using on Normal with a full group.

http://us.battle.net/d3/en/calculator/witch-doctor#aiUdST!bc!aaaaaa

So far everything just wastes away before my teammates get to the mobs. The only person who catches up to me is the barb that has to leap into a group to get any dps in. I absolutely love Locust swarm on lager mobs since it will just jump from pack to pack to pack front loading my damage done.

The only thing I actually "spam" is acid cloud but mostly as just to blanket an area in poison, locust swarm I don't spam, I only keep it active.