CANTON HOUSE is the favorite for dim sum in Atlantas Chinese community. Were not surprised. Few dim sums are operated with such efficiency and such a broad menu. Novitiates will wave and say bye-bye to carts bearing chicken feet and pig stomach, but nobody leaves hungry. Anything made with shrimp or barbecued pork is bound to please even the most unadventurous diner. Get the rice cooked with pork, wrapped in lotus leaves. The fragrance when it is unwrapped is worth the price.