If one takes a unit of DoW Ironguts, can one take an Ogre Kingdoms Magic Banner for the unit, or is one restricted to the War Banner only?

Hmm tricky one, I would think you can take an ogre banner, but they are all pretty pants, so I would stick with the good old warbanner...

Notice how Chili says "one", not "I". Something tells me he's finally interested in Ogres but is in denial...

On the actual rules question, I'd agree with Ras. None of the ogre banners are worth it unless you're playing against a specific Kislevite special character (Katerin).