[Khorne's Fist]

Because Cadians, Catachans, Death Korp and Valhallans all fit stereotypes from our own recent history, and sell more minis and books. Personally I'd like to see more Armageddon Ork hunters, but they are a bit too close to Catachans. I'd also love to see something with Savlar Chem Dogs.

What these smaller IG regiments need is one of the writers to take a shine to them and develop their fluff beyond the small blurbs in the codex.