The most active Jewish Community in the region is
Kiryas Joel, in southern Orange County.
Good Orange County locations with ~30 minute commute: Monroe, Woodbury, Central Valley, Cornwall, New Windsor, Vails Gate, Town of Newburgh, Montgomery
You won't want to go too far into Westchester or that commute will get pretty long. Perhaps Peekskill, at the northern tip of the county, would work.
Danbury is a neat city but the commute would be a little long.
I also wouldn't toss Dutchess County out of the equation either; it isn't really "isolated." Towns like Fishkill, Wappingers, and Beacon are appealing options.
Let me know if you need any particulars about a location!