City View on Commercial alley in SF is decent. They have carts and good standards like har gow and siu mai. I am generally happy with those solid offerings.. I would also second Canton on Folsom St. for decent standards.
I would also re-plug Legendary Palace in Oakland for bustling, loud, cart-driven action at value. They have more fringe elements like the hairy pigs knuckles in soy sauce whIch my friend was excited to see. I was not so happy after sampling. But that's the beauty of dim sum, right? You get to try and it doesn't hurt to miss. There is always something on the next cart to please your taste. Oakland Chinatown is also a fun excursion.