The White Plains Expo is the biggest one that they put on in the area. There is some redundancy, but many vendors who to the NH show, like NERD, do not go the White Plains Expo, and vice versa. Vin Russo (Cutting Edge Herp), for example goes to White Plains, but I am pretty sure he does not go to NH, etc.
http://reptileexpo.com/white-plains.html
So you might want to check out the vendor list and/or determine what you are looking for before the show, to see which show might be best of that type of reptile.
Feel free to post to ask for some breeders in the area who might be best for what you are looking for (my apologies if you already did and I missed it), or PM me anytime.
Good luck.