Firstly, I'd recommend using my
Adeptus Ministorum list, as it's the most up to date (and only active) Sisters list.
For a balanced 2000 points list, I'd look at something like:
Adepta Sororitas Mission (8 Battle Sisters) 225
--- Transport (4 Rhinos) 40
Retributor Ministry (6 Retributors) 250
--- Transport (1 Immolator, 3 Rhinos) 60
Seraphim Choir (6 Seraphim) 225
Repentia Confessional (6 Sisters Repentia + Mistress) 250
--- Transport (3 Repressors) 90
Exorcism Battalion (5 Exorcists) 250
Hunter 50
Redemptionist Crusade (10 Redemptionists) 150
Penitent Atonement (4 Penitent Engines) 250
Lightning Squadron (2 Lightning Attack Fighters) 150
1990 points