Chain Flail. Nothing is more effective than having the ability to launch a flail up to fifteen feet and sweep it around to knock people down and smash vehicles aside. In addition to it being powered and the ability to come in a pike format with a boltgun build into the shaft, it is one of the ultimate vanguard weapons. My second choice would probably be the Guardian Spear which is what the Chain Flail is based off of.
Sorcery, it is simply too powerful to be ignored. Also, swords. Simple, yet perfect for the duelist who values elegance above all.
The Imperiums next greatest weapon, a giant airblast flamethrower to send all of those heretics back into the Eye of Terror as soon as they are vomited out.