First, I think that it should be noted that the most "in" restaurants are not always the most classy, nor do they always have the best food. That said, as a teen that eats out a little more than I probably should, I can safely say that as long as you aren't disruptive and are generally polite, restaurants will be teen-friendly.
I think it would be easier to help you out if you could clarify your priorities. Do you want to go to the coolest new place in town or a slightly older, less trendy, restaurant with suburb food?
I would be happy to suggest some places, but more details would be helpful. Thanks.