I'm coming to Denver for a conference and wanted some suggestions for restaurants that would be good for dining alone. I found a bunch of restaurants with menus I like, and wanted input on the atmosphere - for dining alone I either like (a) really quiet places or (b) mildly crowded places but not super noisy, where I can people watch (i.e. Balthazar in NYC). I'd appreciate advice on which of these places fit that description (don't mind paying up to ~30 for entree, but want to avoid places w/ prix fixe...): Barolo Grill, Le Central, Ninth Door, Cuba Cuba, Yanni's, Fruition, Rioja, and any other suggestions people have? Thanks!