Photorama is another decent one, Sam and more recently his son Abraham have a long history of shows, having started here in Michigan, Photorama was at one point the largest camera show in the United States. Although I don't believe they go to NYC anymore.
Second Sunday show is alright, but good luck finding any sort of deal outside the bargain bins (full of leather half cases and long lost parts of useless rigs) Unfortunately if it has a name brand on it, the prices are greatly exaggerated. Although I attend the show regularly, its become more of a hangout than a swap.
The large camera shows/swaps are on the decline, eBay has single handedly destroyed the market for these used vendors. I can full heartedly see why, anyone can be a bargain hunter and find a great price on your favourite equipment, why drive hours to a show to pay twice as much!?
If you enjoy being around like minded people, enjoy stories of the "old days", and can stand some horrible coffee in paper cups, Second Sunday is your show.