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You definitely want to talk to a lawyer that does Employment Law. You can find one at www.lawyers.com and in the section for Area of Practice enter Employment Law. That website also lets you search by location so you can find one close by.
It is hard to prove gender discrimination based on one salary alone since it is always possible for an employer to offer an excuse as to why one employee is paid lower than a peer. The way these cases are "made" is to show a pattern of discrimination and where the employer pays one gender less than another on a regular basis.
This can be done through the discovery process and getting paperwork showing they do this over and over. Of course, as you can image, it is a lot of work to find this out but it is certainly do-able.
Also, as with any discrimination case based on membership in a protected class you have to file a charge of discrimination with the EEOC and allow them a chance to investigate. At some point they will either 1) file a lawsuit on your behalf or 2) send you a "right to sue letter". If you don't file with the EEOC then your case will be dismissed as you will have "failed to exhaust all administrative remedies".
You have a short time period in which to file with the EEOC, as short as 180 days in some situations, so you want to meet with a lawyer quickly. The lawyer may even want to be involved with the EEOC filing, possibly just to look over the paperwork to be sure you don't phrase something incorrectly or in a way that can hurt you later.
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Of course, please feel free to ask any follow up questions in this thread. I want to be sure that all of your questions are answered. In addition, once you issue your Positive Rating the question will lock open and you can come back to it anytime in the future if you think of something else.