If your local supermarket has Fage get the "Total Classic". Basically stay away from anything that says 0% or 2%. If you have a Trader Joes nearby their Greek yougurt is good as well. I like granola in mine. I have also put craisins in it. Or add your own fruit at home. My faves are raspberries and strawberries.
There's way less sugar in fruit than there is in HFCS and/or table sugar laden jam. (ex: 1 tbsp of smuckers has 12g sugar, vs approximately 0.08g of sugar per every 1 actual raspberry.)
If you were to put a small dollop of jam on 1 cup of yogurt, then that'd be comparable to putting 150 actual raspberries in, at which point you'd definitely have more raspberries than yogurt to the point of hilarity/incredulity.