Question about Google Maps plugin

We are working on a project to rebuild an Interactive Map for the American Red Cross to replace the map on this page: http://preparesocal.org/disaster

The datapoints for this map will come from various govt sources like http://www.usgs.gov for earthquakes for example.

I have an initial design comp for the new map which I have posted here for reference:

http://www.designstudio.com/resources/redcross/new-interactive-maps.jpg

I am curious how much customization your plugin would need in order to meet our requirements for this project. I am also curious what you would charge to handle these customizations.