[thejeff]

Yeah, no idea why you'd want an air bless. I'd go with the standard water and either Fire or minor Death, all dependent on the sacreds of course.
Extra attacks and damage (or afflictions) to add to the swarming. Extra defense to keep from being hit. They do enough damage more protection isn't as useful.

If you're thinking of Air bless for the uber archers, they're really not that bad. Sure they do a lot of damage when they hit, but I'd still rather have 2-3 times as many shortbows, especially early age where there's less armor in general. Fast sacreds will close quickly enough you'll have friendly fire problems anyway.

The Dawn Guard may have the usual giant weaknesses, but they work much better than any other non-sacred giants I've played with. High stats, decent protection (for the age), magic weapon, not too expensive.