I will be in Chicago for a business trip staying at the Sheraton Hotel and Towers. I would like to be able to walk to dinner on Friday and Saturday night and hopefully find a comfortable place to dine alone. I'm looking at Frontera, Purple Pig and Sable. I want good food and good drinks (including beer). Moderately priced. I'd rather be able to sit and eat at a bar then a table. Are these good choices? Any others. I found great restaurant suggestions on the board but not a lot for solo dining. Thanks!