What new tennis racket should I get?

The racket I'm currently using is the Wilson n5 Oversize. I like the racket, but I think it's time to move up. The racket feels a little light and I seem to need to exert a lot more energy to hit deep into the court (which I want to be able to do). I want a new racket that is preferably 100'' or around that face. Also I'm a freshman and I will be trying out for JV tennis at my school in the spring (no freshman team) if that helps.