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If Humble isn't too far away from you, I can recommend Wang's Martial Arts, http://www.wangsmartialarts.com/. I first met Yun Yang Wang over 30 years ago when he was assisting Cheng Gwei Yung. He teaches Yang style.

Another Yang style possibility is the Shaolin Kung Fu Academy, http://www.houstonshaolin.com/. Shi Xing Hao has a strong resume, but I can't comment on how much Tai Chi is a focus at the kwoon.

For Chen style, the best-known name is Cheng Jincai, http://www.chenstyletaichi.com/.

I think you'll find most of the activity is in west Houston, in the Asian community near Bellaire and the Beltway. Largely because of its diversity, Houston has long had a strong martial arts presence. As early as the '70s, Houston was right up there in options with California, Seattle, and New York.