text: It never hurts to try new arts or styles.  However, I would pick own art and get a strong foundation so that you always have something to fall back on.  Since muay thai is such great striking art I would suggest you try taking some aikido, jiu-jitsu,  or judo to supplement your tai-chi training.  These arts, especially aikido, will help you better grasp the concepts and applications of tai chi.\nGood Luck