I hadn't heard of cornucopia.org before.

I quickly skimmed three of their highest-scoring egg producers. The main things that worried me:

• "Spent hens sold live." What does that mean? I worry about transport conditions, and about hens being sold to inexperienced, "backyard", or small-scale operations that won't ensure a quick death or stunning before slaughter.
• No mention of providing veterinary care, or euthanasia for very sick hens
• Large flock sizes (hundreds)

[Disclaimer: I'm not an animal welfare or hen care expert!!]