I heart Kirin (located in front of Willowbrook Mall). I always leave happy. Lunch is $11.95 every day of the week. Dinner is $21.95. It is worth it. There are a few more items out for dinner that aren't at lunch, but overall not much. This is a classic example of going out to nice restaurants for lunch instead of dinner to save money.
Kids eat free 3 and under. Overall, it is kid friendly. The food is fast because it is buffet style. They have a fish tank for the kids to look at. Kid friendly food choices (think chicken teriyaki).
I don't know where else to eat that much sushi for less.