Be very careful about buying an extended warranty. Many times by the time you need it, the company that wrote the policy is out of buisness. Make sure that the warranty is backed up by your dealership or the manufacturer, otherwise all you are most likely buying a very expensive piece of paper. This exact situation happened to my parents and in-laws. I warned my in-laws about what happened to my parents before they bought the policy, but they thought it would be OK because they bought from the dealership when they bought their car. When they needed $2,000 worth of transmission work last November, the same dealership that sold them the car and warranty said that the warranty company went out of business and they would not honor it.
About the windshield, a lot of states require that auto insurance cover windshield replacement with a low deductible or no deductible. Find out before you buy.