I snagged two bars last time I was at the Chocolate Room. Both were excellent.
Cacao Prieto is based in Red Hook, and they use only Crillollo beans from the Dominican Republic. Their 72% bar had all the complexity one expects from crillollo beans and the good chocolatey taste from the DR. A very nice combo.
The Rosewater-flavored "Chocopologie by Knipschildt" bar was also delicious. The rosewater is subtle, despite the bright red coloring on the bar, and it adds a nice flavor for those who like it.
Bottom Line: The Chocolate Room is amazing both for the desserts it makes and the stock of chocolate it carries.