Hi, exactly what part of the Bronx is Southampton in? (Just kidding.) But seriously, why not take a look at the Tristate Region board, and re-post your question there? I think you're more likely to find any useful previous postings there, and also it's just a more logical place for your query and the informative responses I hope you will receive.
The Outer Boroughs board is allegedly the place to discuss the 4 NYC boroughs that aren't Manhattan. Though there are often digressions, I think your query may be a bit far-flung, geographically speaking.
Another thing to try is to go to the Chowhound home page and enter Southampton or Hamptons in the Search box near the top of the page.
Hope this helps, and welcome to Chowhound.