Air bags and anti-lock brakes are two key safety features to look for. Resist buying extras that aren't important to you. Compare gas mileage and check with your insurance agent on how your vehicle choice would affect your insurance premiums. This may even reduce the sales tax due on your new car. Your strongest negotiating position will come at the end of the month or toward the finish of a model year.
Dealers are usually more willing to strike a deal when they have quotas waiting to be filled.
And, if an offer doesn't measure up to your needs, don't be afraid to walk away.