Discovering "Les Puces" in Paris

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I am in the midst of planning the details of my upcoming trip to Paris in October with my sister-in-law. One of the things she really wants to do is to visit "Les Puces" (the flea markets) which is something I have never done when I have visited Paris. 
 
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After doing a little research, it seems that we will want to visit the Les Puces de Saint-Ouen...you might remember it from Woody Allen's Midnight in Paris. It is the largest antique market in the world, with over 2500 stalls and has over 120,000 visitors each weekend.
 
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We arrive in Paris on a Saturday, so we will plan to visit the flea market on  Sunday morning. Have any of you been before? If so, I would love any tips or recommendations of favorite shops. I did find this iPhone app which I will download before we go.
 
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What treasures would you search for in a Parisian flea market?
 
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I would love to find a clock like the one pictured above...and maybe a few of those Chanel beauties.  And, how amazing are those champagne buckets?
I may need to pack an extra bag for all my les puces purchases!