I concur with the psykers. Somehow my army does not feel complete when I cannot perform actions in every phase.
My favorite build is with terminator armour, force axe and a perfidious relic in combination with some Death Wing terminators.
Azrael used to be my goto HQ in combination with the Banner of Devastation, but I shelved him since the introduction of this edition. Maybe it is time for a reevaluation.
A chaplain on bike accompanied by some Ravenwing knights is also quite nice, although I feel a powerfist is overcosted for them since they already have a 'special' melee weapon.