That is right mate I will wait for the book to come.
Im thinking of making him a Chaplain ofcourse with the red armour, it just looks better :D.
My Sons of Horus are based on the part were the betray the Emperor. They dont wear all the Chaos stuff but I use the CHaos Codex for them.
The LAnd Raider is the black of the first company with Horus in black armour and the squad he rides with also in first company black.
Putting a dark red CHaplain in the squad as a counts as Sarge looks better than a grey one in my opiniun.
Im thinking of this style on the pic with the eagle ofcourse.http://wh40k.lexicanum.com/wiki/Erebus
Thanx for the reply mate :D