Here are all of my dedicated Horus Heresy Ultramarines and vehicles in one spot. I have other models that can do 30/40K double duty (land raiders and drop pods).
I don't have much faith in them but hopefully the rumors of a 30K boxed set will turn out to be true and I can finally get the rules for less than a pound of gold. Speaking of which, yes I have cheated by using figures older than half the players, third party products to 30K-out my figures and recycling stuff that dates back to the Rogue Trade edition. They are still GW enough to be legal (barely in a couple cases).