When the ladies who lunch go shopping, the Zodiac at Neiman Marcus is where they lunch. With good reason: linen tablecloths, weighty silverware, courteous, attentive table service, chic white-on-white décor -- oh, and the food's topnotch. The lunch-only seasonal menu might feature a velvety bisque, a decadent chocolate soufflé cake or the lobster cobb salad, a vertically presented triumph in classy Atkins cuisine, which of course made it a runaway hit here last summer. (Shopping makes for great cardio, but a gal needs all the waistline-trimming help she can get.) It's pricey, yes, with many main courses up in the teens -- but then again, it is the Plaza.