By Lenn Thompson, Executive Editor There are few Long Island wines with as much of a cult-ish following as Paumanok Vineyards 2010 Chenin Blanc ($25). The Massoud family has had unequivocal success with this "interesting accident" and yet, it remains a one-of-a-kind wine on Long Island. No one else has planted chenin yet. The first thing you might notice about the 2010 is the price — $25 — down a few dollars from the last couple of vintages. With a new chenin vineyard coming into its own, the Massouds have more fruit to work with, production has increased and the…