Is the Prius Navigation System Worth $3000?

Two different dealers in Virginia have a red Toyota Prius on hold waiting for me to pick it up. One has option package #7 which includes, among other things, the side airbags that we definitely want. The other has package #9 which costs $3000 more and includes everything in package #7 plus a premium sound system, a security alarm, an autodimming rearview mirror and the voice activated GPS system and bluetooth hands-free phone. Basically the issue is the navigation system. I know if I don't get it I'll be kicking myself everytime I need directions. But $3000 is a lot and I'm not sure we'll really use it enough to make it worth that.

Here's a site that describes the navigation system.