I despise shampoo, and only use a clarifying poo once/month because I've always read that it's needed to rid my hair of the cones I use. I use V05 Clarifying Shampoo, or Ions Clarifying Shampoo.
Last summer, at the beginning of my HHJ, I used Jane Carter's sulfate free shampoo, and I was surprised at how non-stripped my hair felt afterwards (not as good as co-washing, but not bad).
HTH