[quote=Mortarion]
Hahaha, I like both of them they are my favorite gods. I am still thinking, but I really like the idea of a psychrometer Tech-priest maybe I could make a traitorous Q'sal magister?
[/quote]

If it helps I am not using alignment restrictions so you can match any class with any god within reason and you can choose your god despite any other stuff like what traits you pick. 

I am not sure what you mean by traitorous.

it is crazy how many different psykers there are in Black Crusade:
Psyker - baseline, do not underestimate
Sorcerer - Bolter you while he blasts you with lightning
Q'Sal Magister Immaterial - Super psyker
Idolitrex Magos of Forge Polix - Psyker Heretek
Writhing World Sorcerer-King - This guy just looks horrifying.
Thousand Sons Sorcerer - Space Marine with extra emphasis on blasting you with lightning