Which brand of Stevia has the cleanest taste and least aftertaste?

For those that don't know, Stevia is a plant extract with an extremely potent sweet taste. I use it when making tea.





I first bought 2 kg through "emperorsherbologist.com". It is probably one of the stronger/sweeter blends, but also has a moderate leafy/bitter aftertaste when I reach my desired sweetness.





I bought a small trial package from "herb-care.com". It turns out their blend is maybe only half as sweet, but the bitter aftertaste is almost completely absent. They also have a "spoonable" blend that was included in a small package, and although this is not concentrated, it has a very clean taste and would be easier to use in a cup of tea (verses a pitcher).





Most blends offered on ebay etc. are very bitter and poor quality. If you have tried more than one blend, please tell me which one had the cleanest taste and where to get it (if for instance you lick some off your finger, that's when you will know since it's pure). It doesn't need to be the sweetest or most concentrated.

Which brand of Stevia has the cleanest taste and least aftertaste?
sweet leaf is the brand name,,,,you can find it at stevia.com...they also have some interesting flavors