This is a pretty late response to this question, but I wanted to provide an answer to people who may happen upon this search.
Neustar Localeze is one of the four primary databases: the others are Acxiom, Factual, and Infogroup. Neustar Localeze is more expensive than, say, Moz Local, because you're getting something more meaningful: you're updating one of the central databases that thousands of other directories rely on to populate their listings. I would suggest that it's worth it.
