When I buy a chocolate bar, it's usually dark chocolate in the 85-95% cocoa solids range. Today I discovered a really dark bar at Trader Joe's (their chocolates generally top out at 72%). It's called Montezuma's 100% Dark Chocolate Absolute Black with Cocoa Nibs. The British bar is 93% chocolate liquor and 7% cocoa nibs with 0 sugars and a net 2 g carbs per 25 g.
Really intense, but I like it.