Hey Tom, I'm also in Dallas and I've been looking for something like this also.
I found two places. Haven't been to either, but I am planning to go to the North Texas Shooting Academy in June to start off with. It looks like it is more IPDA/IPSC oriented, but I'm going to give it a try. Tac Pro shooting looks more high speed, defensive shooting oriented. I'll probably plan on doing that next at some point.
Here are the links. NTSA is just north of Dallas and Tac pro is west of Forth Worth it looks like.
Good luck, and let me know if you come up with something.