In the dominion squad you have four storm bolters from the special weapons table and the superior has a storm bolter from the ranged weapon table.
The melta, combi melta set up is also good, but expensive for points and usually over kill. A combi melta and two meltas and two bolters is a good set up, and you can have that in a standard sister squad.
In standard sister squads, id maybe go for a plasma pistol swap for bolt pistol, keeping the bolter for range. However for 2pts a storm bolter is a great investment, providing the firepower of two sisters for 7pts less. Im not a fan of handflamers or inferno pistol due to range.
Ironically, due to their financial cost, they are a good hoard army. Individually they are fairly cheap points wise. Also fluff wise, unlike marines, there are millions of them. You can generate lots of CP's, but without the stratagems to spend them on you are limited in use.