I couldn't tell from your post if you were looking only for suggestions for Sang's or if you don't normally eat Dim Sum and don't know what to order in general so I'll go with the latter, LOL! I haven't been to Sang's but my father owns a Dim Sum restaurant in Kentucky so I'm familiar with the menu items. Whenever I travel, I find a place that serves Dim Sum and I normally order Har-Gau (shrimp dumplings), Siu-Mai (pork & shrimp dumplings), Pai Quat (not sure if I spelled that right but basically small spare ribs in black bean sauce, yum!), Chow Fun (Wide noodle steamed with shrimp, beef or pork with soy sauce over the top), Nor Mai Gai (sticky rice with black mushroom, chicken, shrimp in the middle wrapped in a lotus leaf). I don't eat Fung-Jao (Chicken Feet) or Beef Tripe but if you're brave, go for it, LOL!
Some other things I like are:
Black mushrooms or green peppers stuffed with shrimp
Sesame balls stuffed with bean paste
Also, Cha-Siu-Bao (Barbecued pork buns) is a must.
I hope that helps some:o)