The Astropath

Telepathic Relay: Add +1 to any reserve rolls (or none). When outflanking, re-roll the dice to see where you come in.

Pretty good stuff. In most Guard armies, I'd recommend one Astropath.

I don't think you really need +2 to reserve rolls for a standard Guard army, although it does help in Dawn of War and in certain army builds.

The second effect, outflanking re-rolls...is nice but adding a second Astropath doesn't add anything to it. Much like the Eldar conundrum of Farseer or Autarch, where an Autarch has dubious other abilities...same thing here.

Just one gives you a big advantage. Two only gives you a big advantage some of the time.

So bring one along. He's useful enough to warrant 30 points, but not so useful to warrant 60 points (as much of the time, he doesn't do anything).

When coupled with the Officer of the Fleet, hopefully you'll see why +1 to reserves is good enough in Dawn of War. More on that guy in a post later today. :)