If you're shopping for a new car, chances are you're considering things such as gas mileage, vehicle size, comfort and even that all-important CD system. But have you checked on the cost of insurance?

A quick call to your agent might help you narrow your choices -- and avoid a second case of sticker shock after you drive your new car home.

The reason: Along with your own driving record, your ZIP code and the demographics of the drivers in your household, the make and model of your vehicle can have a big effect on your insurance bill, says Russ Rader, spokesman for the Insurance Institute for Highway Safety. Of all of those factors, the type of vehicle you put in your garage is the only variable you can change immediately.