Aji Taro is one of the best places to have sushi in Richmond. My wife's parents told us to check it out and we were very impressed by the quality.
You can choose from either the all-you-can-eat menu or ala carte. We liked the specialty california rolls with mango and the salmon sashimi. Our favorite dish is the Hamachi (yellowtail fish)! We first ordered it raw, then finish off our meal with it cooked. Again, the quality is excellent!
I dont know how many sushi restaurants there are in Richmond (probably 500 or more) but this is one of the best places.