It would be an excellent idea for the City to come on board with the system. Spotsylvania should also think about joining, since they're using a mostly-analog EDACS system. It would be good to get everyone on a P25 system. In Spotsylvania's case, however, they could communicate with Stafford and/or Fredericksburg using the analog 800 MHz mutual aid channels (8Call, etc.).
Do you know any other details about the system?
Thanks,
Dave