Wyeast 4766 Cider Yeast
Recommended by the dude at Strange Brew in Marlborough. About $8 per package, which is a bit much.
From Wyeast Laboratories...
Crisp and dry fermenting yeast with big,
fruity finish. Creates a nice balance for all types of apples,
pears, and other fruit. Allows fruit character to dominate the
Temp Range from 60-75% and an alcohol tolerance of 12% ABV.