Space Marine voice filter in Soundbooth

[Renegade Paladin]

I'm putting together a demo reel to audition for a voice acting role in The Lord Inquisitor (http://thelordinquisitor.com). I have Adobe Soundbooth, but I've never tried to recreate Space Marine voices before. So far I've stacked the cold drum room reverb filter, a mild metallic vibrato, and heavy chorus onto the recordings, and it's fairly good, but I'm not happy with it. The original Dawn of War Grey Knight sound is what I'm going for. Does anyone have any ideas?

For reference, I'm trying to get something close to this. (http://www.youtube.com/watch?v=ilSDgI1JONw)