I like the Polish chocolates Delicje and Ptasie Mleczko. The first is a cookie with a typical strawberry, raspberry, or cherry filling. The second has a marshmallow filling. Both very tasty.
Favorite is Cookies and Cream Hershey bar. I don't tend to memorize their cocoa percentages. I just look at the first couple ingredients to make sure their isn't anything shady about them. I also look to see if it has an encircled K or U.