The second game last night, I changed the list a bit, and it was pretty awesome:
HQ:
Ahriman
ELITES:
Hellbrute
TROOPS:
Thousand Sons (9) - asp sorcerer w f.axe
Thousand Sons (9) - asp sorcerer w f.sword, meltabombs
Rhino
Thousand Sons (9) - asp sorcerer w f.staff, meltabombs
Rhino
HEAVY:
Land Raider - dozer blades
Predator - tri-las, dozer blades
Obliterators (3) - MoT
Again, the true star is Ahriman himself. His Master of Decepton is awesome, allowing Thousand Sons troops and Oblits to outflank or infiltrate. His ability to manifest 3 witchfire powers per turn is just awesome. And leveraing on Tzeentch, Biomancy and Telepathy powers are really cool. Pyromancy is great too, but being Tzeentch, it's ok lar.