If you think you might go into a field which requires knowledge of securities regulations, then it's definitely best to try to take the class in law school. Of course, when working, you'll be required to learn more about your specialty, but it'll be really difficult to have to learn a subject from scratch. That's why taking core bar exam subjects while in school is so important.
Nice nonsequitor to pimp your "service." Hopefully you are better with the logic when tutoring or else you should pay people for your "help."
For the original poster, it depends on what you're going to be doing for a corporate practice. If you get into corporate practice with a firm or the government you may find having the securities background helpful. Such jobs are very competitive (ie, high grades required). You may also benefit from a background in accounting or finance.