I also play the Tabletop as Orks and Black Templars. I hoped to make an Inquisition Army out of Grey Knights at some point but never got to it. I've read through basically all of the Codexes til after they ret coned Necrons, have read about 8 of the Space Marine Battle Novels, the Ravenor, Eisenhorn, and Inquisition Wars Omnibuses, and the first five books of The Horus Heresy. 

As for games, I've played all of the Dawn of War games, Space Marine, and tried Kill Team's demo but dropped it after it sucked.