Here's a list that's worked reasonably well for me.
HQ
215pts:
Grey Knight Grand Master: psycannon, teleport homer, Grimoire of True Names, Holocaust power
199pts:
Grey Knight Terminator Retinue: 4 Termies, 1 with incinerator
261pts:
Inquisitor Lord and RetinueInquisitor Lord: bolter, targeter, refractor field, consecrated scrolls, Hammerhand and Holocaust powers
Familiar
2 Acolytes: bolters and power armor
3 Gun Servitors: 2 heavy bolters, 1 plasma cannon
2 Sages
1 Mystic
Elites
80pts:
2 Death Cult Assassins Troops
130pts: Stormtrooper Squad 1
Veteran: power weapon, teleport homer
5 Troopers: krak grenades, 2 melta guns
59pts:
Rhino 1
130pts:
Stormtrooper Squad 2Veteran: power weapon, teleport homer
6 Troopers: 2 plasma guns
59pts:
Rhino 2 Fast Attack
210pts:
Grey Knight Teleport Attack SquadJusticar: teleport homer, meltabombs
5 Grey Knights: 2 incinerators
Heavy Support
158pts:
Dreadnought: twin linked lascannon, missile launcher, extra armor, smoke launchers, Blessed hull.