Take 10 minutes and draw yourself a map. 57th street alone has Audemars Piguet, Franck Muller, Tourneau, Wempe, etc. Madison Avenue starts with Cellini on 51st, Panerai on 54th next to the largest IWC boutique (announced but not open) and going north has Breguet, Chopard, Lange, UN (I think) and 3-4 others. And yes, if you are in for looking at random ridiculous high end watches 47th Street between 5-6th is the place. You will never see so many Patek's in the Patek "lunch sack" or tourbillons from everyone. There is far more selection of virtually every brand there than in any boutique. If you are here for days I would split it up with an hour or two for the retail shops and an hour on 47th Street. Have fun.