The definition of a "good" SAT score is tough to pinpoint. It depends significantly on the types of colleges you're looking at and how much you've improved from your baseline scores.
The infographic in this article will go through statistics on the national level and at different colleges to give you a better sense of what a good score might mean for you. This data should help you to see your score from a more informed perspective and decide whether you need to keep working on it to make improvements.