Once you go Sweet Designs, you don't go back.
A lot to choose from. Their organic bark comes in a variety of flavors-- my favorites are salted almond and coconut. It's ridiculously good albeit a little pricey. The nonpareils are another go-to and they come in white, milk or dark chocolates.
Street parking on Detroit can be a little hairy but the best chocolate you've ever tasted is your reward.