Options - Think safety
Decide ahead of time, which features you want in your new car. Be aware that not every model has every feature you may be looking for. You may have to compromise by settling with one less feature or spending more and choosing the next model up.
Consider safety options as your best bet: antilock brakes, traction control, side air bags etc. You may be offered a larger engine, but nine out of ten new cars perform just fine with the base engine - and you'll save on fuel in the long run.
While extras like rust proofing, extended warranties and other assorted services, may be valuable, it may be more economical to purchase them outside of the dealership. If you are interested in any of these extras, you may want to do some comparison-shopping first.
Take a Good Long Test Drive
Test-drive the vehicles. There is no better way for you to determine whether or not you feel comfortable with a car than to take it for a test drive.
Narrow down your choice to two or three models and go out for as long as the salesperson will allow - ideally, a minimum of 30 minutes. Some dealerships may have insurance restrictions and therefore will only allow you to go on a test drive with a sales representative. Ask to drive it yourself if possible.
Take a friend and or the kids along. Take the highway. Try to park. Move the seats. Work the switches. Load some cargo. In no time, the car's strengths and faults will become clear, helping you with the decision.