I've never used Keraphix but have heard great things about it.
Nexxus was sold to Alberto-Culver and will be mass marketing their products to stores like Walmart, Target, CVS, I've seen all their products in Rite-Aid except for Emergency. Call your local JcPenney, I went right before Christmas and the salon rep informed me that they had just received the line and they'd be carrying it from now on. Good Luck!