Welp, I feel pretty far on the fringe, since I'm mostly more of the everything but the Tabletop sort of guy (cheapskate I am). I do have a shit ton of the Fantasy Flight pen and paper style games, such as Only War, Black Crusade, and Dark Heresy. I've recently been doing a version 2 of some stuff for like a fictional subsector using 1d4chan's creation tables since I'm retarded enough to think I can DM such a game.
I had to scum two spess mahreen chapters because they were turning into repainted Ultramarines before I got one I was more happy with. I'm okay with the Smurfs, but if I wanted them in the region, I'd have just taken their shit either wholesale, steal one of their children chapters, or repaint them for the game.
I also rolled a penal legion (I had to scum their first incarnation due to them being basically the Last Chancers) and will likely shit out a couple of other interesting regiments and whatever else for the imperium. Then I'll build up more info on my Ork Freeboota and some other threats to the region (namely Necron, Eldar, and Chaos). I'd include Tau and Tyranids, but they're not in that sector of the Galaxy.