Lots of people refer to the IDEAS list: https://ideas.repec.org/top/top.uslacecon.html. This list seems to be based primarily on the publication record of the professors in the department, though, and not necessarily undergraduate teaching or external opportunities. Still, it’s a place to start.
Another thing to consider are what colleges are good at placing student at top post-graduation jobs. Really, it’s the job you do between college and b-school that helps determine where you get in, but the top firms are competitive places that value prestige. Most of the top schools on that IDEAS list are probably going to be pretty well-known for sending their grads off to top consulting, banking, hedge fund, et al. types of places, though.
The University of Richmond might be a particularly stand-out place for you to consider. It’s a comprehensive LAC, but they do have an emphasis on business and they have their own business school with an undergrad program. You get a little of the best of both worlds. And the student body is relatively diverse (as far as top schools go) - 31% students of color, 13% first-generation college students. Richmond’s a pretty diverse city.