If you're going to the Mag Mile area then Sur la Table on Walton between Michigan and Rush is a great option. If you're in the cooking business they have a 15% industry discount and you just have to show them a business card or some type of proof. If you're able to get out around the city a little more then I'd recommend Northwest Cutlery on the corner of Lake and Halsted in the heart of the meat packing district. They sell to all of the local chefs and do knife sharpening while you wait. Definitely more of a professional store than Sur La Table which, as nice as it is, definitely caters to the "Suzy Homemaker" crowd. Hope this helps.
