You might want to buy plain yogurt (Dannon's is as good as the fancy stuff--I like the whole-milk but that only seems to come in quarts), and then flavor it yourself, with fruit or jam or what-have-you. That lets you control the sweetness, and avoid the artificial stuff. My default is to pull some (commercially frozen) raspberries out of the freezer to defrost, and mix them with the yogurt, no sugar, no anything else. But things like lime juice and honey work too.