Well, if by good stuff you mean fertilizer, then Miracle Gro Potting Soil has it mixed in. However, I must mention that many people have had problems with gnats living in the soil when you buy it. Also with MG, you cant control the amount of ferts you give your plant, so you have little control over it.
I reccomend getting a basic potting soil with no added fertilizers, and then get Jacks Classic Dynamic Duo for fertilizers.