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A potential army list ripped of Wargamerau with comments attached. 

HQ
Cannoness – Jump Pack, Cloke of St Aspira, Blessed Weapon, Inferno Pistol & Melta Bombs
135 pts

Elites
Celestian Squad x 6 – Flamer, Heavy Flamer, Frag Grenades
VSS – Book of St Lucius, Bolt Pistol & CC Weapon
Immolator – Extra Armour, Holy Promethuim & Smoke launchers
260Pts

Celestian Squad x 6 – Flamer, Heavy Flamer, Frag Grenades
VSS – Book of St Lucius, Bolt Pistol & CC Weapon
Immolator – Extra Armour, Holy Promethuim & Smoke launchers
260 pts

Troops
Sister Squad x 13 – Flamers x 2
VSS – Book of St Lucius & Storm Bolter
179 pts

Sister Squad x 13 – Flamers x 2
VSS – Book of St Lucius & Storm Bolter
179 pts

Sister Squad x 13 – Flamers x 2
VSS – Book of St Lucius & Storm Bolter
179 pts

Fast Attack
Seraphim Squad x 8 – Twin Flamers x 1 – Melta Bombs
VSS – Book of St Lucius, Purity Seals, Bolt Pistol & Power Weapon
245 pts

Dominion Squad x 6 – Flamer x 4 & Frag Grenades
VSS – Book of St Lucius, Purity Seals, Plasma Pistol & CC Weapon
Immolator – Extra Armour & Smoke launchers
206 pts

Heavy Support
Exorcist – Extra Armour & Smoke Launchers
143 Pts

Exorcist – Extra Armour & Smoke Launchers
143 Pts

Retributor Squad x 6 – heavy bolter x 4
VSS – Book of St Lucius, Bolt Pistol & CC Weapon
166 Pts

Hagen’s thoughts are:

Canoness: ditch the Jump Pack & Meltabombs and get a BoSL
Celestians: As Michael suggested, get an Eviscerator on your VSS as they hit everything other than MC’s/IC’s/Vehicles on 3′s (that includes Dreads). Also ditch the flamer for a meltagun.
One of the Celestian squads should be on foot supporting your infantry, so ditch an Immolator and increase the squad size to 10.
Battle Sister Squads: If you are going to arm your squads with Flamers at least give the VSS a Power weapon rather than a Storm Bollter… Also, as has been suggested, upgrade to one HF. And get a meltagun.
Seraphim: Personally I like my VSS to have an Eviscerator. Also arming the entire squad with Melta bombs is expensive, it’d be better to take a TL Inferno Pistol IMO.
Dominions: I wouldn’t waste my time with them, I’d take either another Seraphim squad or change them to a normal SoB squad in a rhino. And agree again (!) with Michael, ditch the Plasma pistol!
Exorcists: Consider giving at least one a Dozer Blade so you can deploy behind area terrain then move into it.
Retributors: Waste of time having these at 6 models, you need 10 for the AoF and the VSS just needs a bolter (why a BP + CCW when you don’t want to be getting these into combat?). Also a BoSL is a bit superfluous here, if they are in combat this is a bad thing, otherwise they have no real need to check on unmodified Ld (hopefully they will be within 6″ of a model that has one)

Personally I managed to get by with just four BoSL in my 2k army list – Canoness, Celestians, Seraphim and one squad of SoB in a rhino. But it’s more efficient to have more.