At this late date, with about 30 days left in which to file, you're going to have a very difficult time interesting an attorney in your case on a contingency fee basis. If it's such a great case, then you shouldn't mind paying attorneys' fees. Perhaps you can interest a Dallas defamation lawyer in a partial fees-partial contingency arrangement. But as you have already figured out for yourself, time is not on your side, and furthermore, you'll need to prove that $200K damages in hard dollars. This is not an easy area of the law, but I wish you good luck!
If you think my response is the best response, it would help me if you would indicate that. Also, please note that my responses to question(s) are NOT legal advice from me to you because I am NOT your lawyer, you are NOT my client, and we do NOT currently have an attorney-client relationship. Thanks!