We'll be using Jason for kids. Seemed to be one of the less expensive ones out there. But we haven't yet, so i can't vouch for it, other than the fact that that brand is popular.
We also don't use sunscreen much. Our backyard is pretty well shaded, and i believe it's good for my veggie kids to get some sun. If there's risk of burning, we'll use it (beach, my friend's perpetually-sunny yard, etc.).
I agree that the chemicals in typical sunscreens are wicked. It's definitely something to be concerned about and to take precautions.