The best is All Natural, with no sugar or any other additives. Dannon makes a good one...
But if you like your yogurt sweetened - The next best, in my opinion, is Dannon Light and Fit. It does not contain High Fructose Corn Syrup and has a low calorie and carb count..
Look how low in sugar it is:
Yoplait Original 99%Fat Free: This 6 oz serving DOES contain High Fructose Corn Syrup and comes in at a whopping 170 calories! The carbs are high, too: 33g with 27g sugar! This is not a healthy yogurt, you can do much better than this one: