I will be in Chicago for two nights next week, staying at the Ritz-Carlton, which I understand is in the middle of the city (it is my first time in town). Where should I go for dinner? I will be by myself, and price, within general reason, is not an issue. I generally try to stick with Atkins-type foods, and my favorite cusines are Asian (specifically sushi), and italian/spainish (with seafood emphasis). By way of reference (I am a New Yorker), my favorite restaurants are Nobu, Lupa, Esca, and Sushi Yasuda.