So: Fall Semester of Junior year, you expect to have an UW GPA of 4.0 and an SAT of 1500, and this is struggling? It’s not. Those two components (GPA/SAT), if attained, are not what will keep you out of Brown, Williams, Claremont-McKenna, etc. It will probably be your essay and recommendations, and possibly ECs. And probably just plain luck. Make sure you spend time on your essay next semester, and in the meantime try to be a good,well-rounded person and make yourself known (for good reasons) to your teachers.
All of the suggestions on this thread so far (esp. including getting the Fiske Guide) are good ones. If you have looked at these schools and determined that they are not suitable for some reason, let us know.
Also, do not look at the “top x schools for econ” lists out there. Most of them rank graduate programs, which smaller schools generally don’t have. That’s why they may not be “known” for having strong econ programs.