Among the elite LACs, Claremont McKenna is the one in which economics comes closest to assuming center stage in the curriculum. (Fans of the school maintain that it has excellent faculty in fields other than econ and polisci, and they also note that CMC students can also enroll in courses at Pomona in the other members of the 5Cs consortium.) Williams is noted for its econ program, and its rich history and strong alumni base are said to provide a proverbial pipeline to Wall Street.
Colgate and Hamilton are not quite so difficult to gain admittance to, and both are known as launching pads for careers in finance.
Of course, economics is bound to be a fairly strong department at any highly ranked LAC–though in today’s political environment, not every campus will have an overall vibe or culture that is friendly towards the career tracks that econ majors typically pursue. Hence if you are considering a range of well regarded LACs, you should probably worry more about your overall “fit” at a school than about the relative strength of that school’s econ department.