xing i is a good start for you, although most good xing i practicioners also learn bagua, because one is no better than the other. my shifu is li tailiang, and he is very adept at all three internal arts. he will use his xing yi fist or power, combined with the superior bagua footwork, so all in all, if your chun is good, you might want something different like bagua, it will teach more circles, which are lacking from most wc, and it will help you beat a wc guy of your same skill level.
bagua circle walking is a superior form of footwork, so again, its up to you.you cant go wrong either way. i think what will really answer your question, is— which art has a good master teaching it in your area.