The Marriott hotels on the island are very nice, not that expensive and offer all the amenities you might want - the ones closest to Woodbury and West Islip would be the Hungtington one or the Islandia one - staying out in the Hamptons would be a commute - not sure you'd want to do that during rush hour.
The nicest place you'll find in that area is the Inn at Fox Hollow in Woodbury.
It's not particularly near beaches. The other hotels will mostly be chains on or near the LIE. If you're doing business in that area you do not want to be schlepping out to the Hamptons.
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