Also, Allen, your bio says that your guy was a Grey Knight... That's a no-no on several levels.

1) the Grey Knights weren't formed until AFTER the Horus Heresy.
2) the Grey Knights are all Psykers, and Psykers can't be interned in Dreadnoughts (Except if you are a Blood Angel... But everyone calls Horse-Shit on that...)
3) Historically. The Chaplains main purpose was to put down Psykers in case they went nuts... As such, the Grey Knights don't use them... Chaplains have very little trust of Psykers.
4) Saying they all went nuts when they went into the Warp makes no sense as the Grey Knights are only taken in for training if they have proven their ability to resist the corrupting energies of the Warp 100%.

Essentially, just choose one of the [url=http://wh40k.lexicanum.com/wiki/Space_Marine_Legions#Original_names_and_appearances]Space Marine Legions[/url]