Depends on your definition of 'decent'. A school ranked among the top 50 would generally require a score of around 2000, especially if you are looking for financial aid. In my opinion, schools look at GPA first and foremost to decide whether to admit you and SAT scores tip the scales and help them decide how much aid to give you. A good GPA and a decent SAT score gets you in. A good GPA would probably be anything above 3.5,