You might want to check out Index Astartes. Index Astartes is a codexish thing GW made that has fluff and some special rules on each founding chapter (Dark Angels, Emperor's Childrem, Iron Warriors, White Scars, Space Wolves, Imperial fists, Hight Lords, Blood Angels, Iron Hands, Worldeaters, Ultramarines, Death Guard, Thousand Sons, World Bearers, Salamanders, Raven Guard and Alpha Legion). I now that the Dark Angels part is just an update for thier codex and i think the Space Wolves part is the same as well but I have only flipped thought the book once at the hobby shop i go to but I'm pretty sure they have Imperial fists rules in it.