Being only 3 blocks away (how do you measure distance in suburbia? minutes by SUV?) from Oishi, we sushi-loving geeks often walk over there for lunch. The price is certainly right (under $8 for a maki roll, three nigiri pieces, salad, and miso) and the sushi is very good.
Still, eating lunch at Miso on Thursday, I was reminded how much better "excellent" is than "very good." They may not offer sushi at 2am, or be the best in St. Louis, but Miso is the only thing worth parking in downtown Clayton for.