Amla Berry, Mud, etc. Natural Shampoos

I want to switch away from using discount store shampoos and start using all-natural shampoos. I'm hoping that my somewhat sensitive skin will do better, and that my scalp won't itch quite as much.

I have shoulder-length, uncolored, unpermed, brown hair. I tend not to use conditioners much because my hair doesn't seem to need much additional oil, and because conditioners tend to make my face break out.

I've been looking at Sierra Soap's amla berry shampoo (see http://www.sierrasoap.com/catalog.html ). Has anyone else tried amla berry shampoos?

I've also looked at Terressentials  Pure Earth Hair Wash, but I have some reservations. To wit: since there is no foaming and my hair is brown anyway, I'm not sure that I will know where I've coated; the whole detox time from your old shampoo sounds a little strange, plus the fact that they suggest buying a big bottle in order to get through the detox time means more of a financial commitment than just getting a little sample bottle. Anyway, has anybody else tried it and had good success?

I've also looked at some of the shampoos that are made from saponified olive oil. I'm a little concerned that they would be too oily for me. (Once again, any comments?)

I've looked at lye shampoos, but I don't know if they would be too harsh. For some reason, I hear the word lye and think hard on the skin.......

To anybody who gets through this rambling post and comments, thanks in advance!