First GK Armylist 1075 pts

This is my first armylist for Grey Knights I've ever done so I would gladly accept any advice that you give me.

HQ:

Castellan Crowe 150 pts

Inquisitor Coteaz 100 pts

Troops:

Purifier Squad
- x5 additional Purifiers (I read in an other post that after you deploy the unit, you can split it in five-man combat squads. So I split it in one
- x4 Psycannons squad with the psycannons and a knight of flame and another one with the halberdiers and knight of flame with
- x4 Force Halberds daemonhammer)
- x1 Daemonhammer (269)

Purifier Squad
- x5 additional Purifiers (Same as above)
- x4 Psycannons
- x4 Force Halberds
- x1 Daemonhammer (269)

Inquisitorial Warband
- x5 Psykers (50)

Inquisitorial Warband
- x5 Psykers (50)

Inquisitorial Warband
- x5 Psykers (50)

Heavy Support:

Dreadnought
- x2 Twin-linked autocannons
Psybolt Ammunitions (135)