You can get a ton of ideas for great places to eat by typing "pitch.com" in the search box and hit search. Links to Pitch Weekly will come up, and the link to the restaurant section is about the fourth one or so down the page! Try clicking on the "Fine Dining" box on the righthand side to see the ritzy places in town. Explore that whole restuarant website. I've learned so much, I now have a list the length of my arm of places I want to try!!
To me, the most romantic place would be Skies Restaurant at the Hyatt Regency in Crown Center - best view of the city going! You can check out their menu, hours, etc. at hyattkc.com/skies
-you could go window shopping at Crown Center before or after, watch them make fudge and taste a free sample, or go to a movie at the theater there, or go see "The Nerd" at American Heartland Theatre.
For something else to do before or after, if she likes art, go to the Kemper or Nelson-Atkins - both always have some neat exhibits, and if you pick the right day, both are free. (Both have places to eat. I love the dining atrium at the Nelson - beautiful courtyard with a gorgeous fountain in the center. The food is good - if you don't mind going through a cafeteria line!)
Good luck! And Happy Anniversary! - B..