I don't usually revive such old threads, but I had to with this one. Sun style Taiji has some principles from Bagua and Xinyi, but it's not a combo of the three. Chen Pan Ling Taiji has alot of Xingyi and Bagua too, but it's still taiji. The style that synthesizes Xingyi, Bagua, and Taiji is called Liou He Ba Fah, or "Six Harmonies, Eight Methods" sometimes called Water Boxing.