Everyone should have a great hair spray that is light, workable, and doesn't give you helmet head. For those reasons, Elnett ($13) is my number one choice. I love that you can spray it on when hair is finished, you can use it with Velcro rollers to give your hair body, and that you can layer it throughout the day without hair getting heavy or tacky. It's virtually impossible to overuse, and always brushes out easily.
My Hair Spray: L'Oréal Elnett