I haven't read through the responses so someone may have already brought this up. I don't want to be off-topic but have you heard Israeli professor Rachel Elior's opinion that the "Essenes" never existed but were in fact Zadokite (Sadducee) Priests ousted during the political chaos that preceded the Hasmonean revolt in the second century BCE.
The Hasmoneans, a priestly family but not of the Zadokite line, cast out the Hellenizers from Jerusalem but instead of restoring the Zadokite line installed their own members in the high priesthood. Some of the Zadokites and their followers challenged the legitimacy of the Hasmonean priestly leadership and seceded from Temple service. This conflict between the Zadokite "secessionists," as Elior calls them, and the Hasmonean usurpers is the theme of many of the most interesting scrolls found at Qumran. Elior views the Qumran scrolls as a Zadokite library, not an Essene library as has been the consensus view. Amid the chaos and intense religious ferment of the Hasmonean period (152-37 BCE), new voices began to be heard - those of scholars known as Pharisees who disputed the legitimacy of the Hasmonean priests and kings and who argued with the Zadokite priests about the solar calendar and their claims to possess an open line to the divine. These scholars, who would become known as rabbis or sages, were unhappy about the exclusiveness of the priests and the power they had accrued through their claims to esoteric knowledge as confidants of angels. In a game-changing move, the rabbis declared that the age of prophecy had long since ended and that the priesthood had been severed from ongoing access to higher authority.
http://www.jpost.com/Magazine/Features/From-the-sun-to-the-moon