I don't think it's been mentioned on Chowhound, but everyone needs to try the Noodle Shop at 59th & Holmes in Brookside. Opened by chef Dennis Kaniger, formerly of City Tavern, Harry's and, my favorite 1990's cutting edge KC spot, Venue, this is the most authentic Japanese restaurant to open in KC.
It has a limited menu from which you may mix and match noodle choices, broth, meats, tofu and vegetables. Other special noodle bowls are available from an overhead board. Side choices are made from a wonderful assortment of pickled vegetables. That's it. The space is bright, clean and in keeping with a Japanese theme, but not overdone. If it wasn't for the tables and counter seating filled with young Brookside families, it would easily fit into Tokyo or Kyoto (my limited Japanese experiences).
Go, pick up a crayon and make your choices,