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So I have a tournament coming up at my local gaming store, 1500 points, roughly 1/3 of which have to be an allied detachment. Just to shake things up (and get ready for October 19th, new codex YES) I've been playing Sisters, running the following list.

St Celestine
10 Sisters, Combi-Flamer, Flamer and Multi-Melta in Rhino
10 Sisters, Combi-Flamer, Flamer and Multi-Melta in Rhino
5 Dominions with Combi-flamer and 2 Melta Guns in Immolator with T/L Multi-Melta
5 Dominions with Combi-flamer and 2 Melta Guns in Immolator with T/L Multi-Melta
10 Seraphim with 2 Hand Flamers and Melta Bombs
Exorcist
Exorcist
5 Retributors with 4 Heavy Bolters
Aegis Defence Line with Quad Gun

That list comes in at 1500 points, and I was thinking about scaling it down to about 1000 points, which includes the cost of the defence line) by dropping the Dominion Squads and Retribuors, and replacing these points with Guard.
What I'm after is any advice of what I could drop in place of these units, and then what Guard units I could take in their place. I was thinking a Platoon with Infantry Teams in Chimeras and Heavy Weapons Teams to camp behind the defence line, but what do you guys think?
Thanks in advance