Another thing to keep in mind once you determine your hair properties is that Kathymack sells samples! The link to her fotki is in her signature, but just in case: Public Home | Kathymack | Fotki.com, photo and video sharing made easy.
(and you can always google "Kathymack samples" if you forget the link!)
I have been able to experiment with lots of different products this way without spending oodles of money. And I love that nothing I bought from her was really chemical-y smelling (I hate when my curly hair smells like it used to when I would straighten it
)! Good luck!