Some excellent advice. My main addition would be that you probably should take a separate course on probability and statistics to go along with the economics course; studies suggest that one economics course is not nearly enough to cure you of the incredible errors in evaluating probabilities and statistics which people tend to make.
Oh, and I say you can keep taking philosophy courses until you can tell whether philosophers are giving you bullshit. If you end up wanting to actually make money, all you have to do is go to law school at that point. While generating bullshit is a good part of being a good lawyer, seeing through the other guy's bullshit is also important, so experience evaluating arguments from philosophy is very valuable. Law schools love a philosophy background in their applicants.
Or you can be like me and be poor.