SAHS,
Maslow had an interesting theory. His only problem is that he defined self-actualization by a narrow set of what he felt were the "highest" goals.
He singled out certain people as examples of self-actualization. In reality everyone is self-actualizing. Even if your main concern is to get food for the day you are no less self actualizing then a person who spends all day contemplating the mysteries of the universe. Some people have strong needs for comfort and security. Others have a dominant need for control and freedom. Our temperament is defined by what we want and how we get what we want. Also what we avoid and how we avoid it.
I would prefer a series of concentric cirlces to a pyramid. The smaller inner circle would represent the number of people who value exploration and have a high tolerance for ambiguity. The other circles would reflect the larger percentage of people that seek security, control and comfort. Just because one person prefers an abstract or spiritual goal doesn't mean they are at the top.