I'm about to buy Giovanni 50:50... the ingredients look nice and even though it's not marketed as a leave-in some people use it for that purpose. It has soybean extract but not in the first ingredients / the online reviews say it's a moisturizing conditioner... The only AO conditioners that don't dry out my hair if used as leave-ins are white camellia and rosa mosqueta: the shea butter in the other ones dries out my hair on about the third day and gives me build up.
Now, if only they had a decent smell LOL
If you are in the uk you could try the A'kin one (good price here, it's too expensive in the US)... I find it really good. Still a herbal smell but a nice one. It's very concentrated. I wouldn't try their conditioners though: they are pure protein, they feel like putting and avocado in your hair.