One of the super markets I live within a 3 minutes walk of has some of these:
The milk chocolate one with nuts and raisins (top middle) is great.
The dark one with whole hazelnuts (under it, to the right) is godlike.
I'm generally not the biggest fan of milk chocolate unless there's something else in it to spice it up. My dark chocolate can't get dark enough! 87% is the highest I've had and it was great. It's also healthier since I don't eat it very fast. One piece has a lot of flavor, so you can just enjoy it for a while instead of chowing down the whole plate in one sitting.