Hmmm...
I'm just a dub, and I've had a few beers, but here goes.
If I were you, I'd start with Provia 100. That's all I shoot for color. Great saturation. You may want a higher speed, though.
If I were shooting a dark subject amidst a lighter, broad background, and the subject were close, I'd use a flash to fill in.
Since it sounds like you'll be in a dark area, you'll lose much of your depth of field, unless you use a tripod, or have a really steady stance. You'll have to open the aperature to bring in more light, which results in less depth of field. You can push the film a few stops, though, to compensate, but you'll lose saturation, and might as well use a faster film.
You may want to think about a tripod, though. That way, you get a stable platform, which allows you to shoot with a slow film, for the highest detail, at whatever shutter speed you want. Any action, though, will be blurred.