Curly girl for life!!!!!!
I do avoid most unnatural ingredients which would include cones and xanes. but it won't be the end of the world if you try a product that you love that has a cone or two in it. It's all about the ease of washing it out of your hair without needing to shampoo with sulfates that can over dry and strip your hair. I conditioner wash only. The only time I use my sulfate free shampoo is when I do an egg treatment or something, which is pretty rare.
Let me tell you there is a transition period where you might get a little itchy, but don't get discouraged, after that you'll retain more moisture and get better curl definition. I'm a convert!! I don't know if you've checked it out or not, but naturallycurly.com has a wealth of info. It renewed my faith in natural products and between LHC and there, I've fallen in love with my natural texture all over again.