I've had a couple of folks suggest putting grav centurions in a drop pod by allying Space Wolves or Blood Angels. I'm leaning toward Space Wolves since the centurions would be able to drop in with a Rune Priest w/ divination (cheaper than Tiggy). I'm wondering what troop choice I should take, though. I could take some Blood Claws in another drop pod or some scouts. What would you guys recommend?