Also, look into the possibility of installing a high quality central station monitored alarm system. You said your neighbors saw a suspicious car in the neighborhood prior to the theft. My guess is that they didn't report it to the police. One of the most effective crime prevention tools, especially when you live on a dead end street or circle, is alert neighbors. Start a Neighborhood Watch program in the neighborhood.
Neighbors watching out for each other is the best crime prevention tool.
When you finish, you will have a good idea of the things you need to do to ensure the security of your home. I recently was given the task of reviewing and, if needed, upgrading security for our properties. I'd appreciate your thoughts on choosing a security expert to assist us. Unfortunately anyone can claim to be a consultant. When choosing a security consultant, look for someone who is independent.