What is the best privacy hedge for me?

Anybody know of any good hedges to plant to help provide privacy from the neighbors?

I'm looking for a hedge that falls into the following criteria...

1. Evergreen (no balding branches during winter/year-around privacy)

2. Child friendly (Not poisonous or thorny)

3. Rapid/fast growing (at least three feet a year, preferably up to 6 feet a year)

4. Doesn't exceed over 30 feet in height, though would prefer something between 6 feet and 15)

5. Grows higher then five feet. At least six feet.

Anything like this exist??? Thanks.