I got two quarts of my favorite maple syrup in the mail last week from Buck Hill Farm, a New York maple farm that used to sell at the Greenmarket in Union Square but no longer does.  Their Grade A Dark Amber ($14.50/quart) is the perfect level of sweetness and complex in flavor, without any metallic edge or off flavors.  I do not believe the Grade B hype -- those just taste murky to me, especially in comparison to this fine, richly flavored syrup.  Buck Hill also offers really delicious maple sugar candies and a spreadable "maple butter", which has the texture of creamed honey (but no actual butter).