I'll go racial feat or paragon class for that, I think. Something like SR as a base racial feature is kinda strong.
As it is, I'm torn on how Favored Class is going to work anyway, since I'm removing the mulitclassing XP penalty.While I can definitely see this, and Warlords being popular among dwarves makes sense, since they're very organized military, I would think Dreadnaught would make more sense in the fact that they are often fighting underground, or in cramped spaces, where a Warlord's auras won't see as much play. Dwarves a certainly the most militant feeling race out there, IMO, and I think the Dreadnaught would just fit slightly better.
But really, either one works.