I've been using D76, stock and diluted 1+1, to develop Tri-X 400 mostly (other stuff too). I like it and plan to keep it in stock for "critical" film, but would still like to experiment with other developers. What might be a good next developer to play around with? I'm thinking Rodinal or Xtol maybe Diafine. Again, the only aim here is to experiment and learn. Thoughts?