This is my go to place for dim sum.
They now have all day $2.90 dim sum which is a great deal. Their har gow (shrimp dumpling) is the best I've had in a long time. Also, if you purchase over $20, you can get a rice bowl (in a stone bowl) for $1.99 (i think it's originally $5.99). They have a large selection of dim sum and the quality is usually pretty good. They are upstairs at the Commerce Gate plaza and also have wifi. You can also get a stamp card... after a certain number, you get a free dish or something. I think it changes based on supply.