Fuckin a, on a T2i? You should put out a tutorial or give me some details on how you managed such little noise! I shoot dark films and shorts on a T3i and always come up with a lot of noise that I'm not sure how to rid! Can you help?
Hey TwinCities, to answer your question:
Always shoot in multiples of 160 ISO, try to avoid exceeding 400 ISO.
Shoot in 24p.
Make your shutter speed twice your framerate (24p = 1/50 shutter speed)
Shoot as wide open as possible (for me, f/2.

.
That's pretty much all I did as far as camera settings...
the real magic is in the lighting (and making sure you have enough of it to maintain an ISO below 400). we used at least one light for every scene, some areas we used three lights. additionally, we had literally 70 candles on the middle table, which added a lot of light. to be frank, what you see in the final edit is quite a bit darker than the raw footage. much of the mood and lighting was done in post.
one of the key practices that helped me was to make sure that i was lighting the subject and none of the background so it really had the appearance of being "candlelit". another difficult part of simulating candlelight was getting the light to look like it was coming from the candles alone, even though we were only physically able to position the lights around the table and cast. there was a lot of relocating going on with the lights, crew, cast and props in order to properly light every shot. do more research and do a lot, A LOT of low light tests in the actual location at which you plan on shooting (the best way to learn is by doing). that way you can take the test footage back to your computer and see what settings work best for you (and the situation) to get the highest quality footage out of your camera. it should be made a point that there is no "one size fits all" when it comes to camera settings and it just depends on the situation and your available equipment.
i am happy i did this film because it shows people that you don't need a huge budget to make something interesting and of high quality (this cost us about $250 total - not factoring in the lights and camera).
it's not the camera, it's the person using it!
happy shooting!