It'd be difficult to say because there are so many unknowns. We don't know what the scenes are, what the locations are, what the action is, exactly what kind of "look" you are trying to achieve, and all that good stuff regarding the interiors.
However, just taking a stab at it, I'd think in many situations like that for "dark, shadowy indoor shots" I'd probably rely heavily on a number of smallish fresnel tungsten instruments. There are a number of brands/sizes/flavors, but I personally like the "Pepper" fresnels made by LTM. I have one particular Pepper kit that contains two 100/200w heads and a 300w head. That'd be a good starting point but you'd probably would want quite a few more instruments than that if your location is very large, you have complex action, or a number of people in your scenes.
Hard instruments like the Peppers (or any other fresnels) will make it a lot easier to get that "shadowy" look you are going for, as compared to soft instruments or flos, etc.
They are, however, not particularly cheap. You might consider designing your lighting plot for your scenes and then just renting the exact instruments you require as needed... your lighting dollars would probably go a fair bit father that way than trying to buy a do-it-all kit just for one particular project.
T2
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Todd Terry
Creative Director
Fantastic Plastic Entertainment, Inc.
fantasticplastic.com