All depends on your set up, if the lens will go to f1.4, I'd not want to go lower than f2.8 or higher depending as you say the required DoF. Next you just need to play with ISO settings, Start at say 800 and go up till you can get to 1/60th of a second or higher depending on what you are shooting. Try and keep below ISO1600, test out before if you can and lastly invest in neat image or Noise Ninja

Alistair


Neat Image - best noise reduction for digital cameras and scanners

Noise Ninja: The gold standard for image noise reduction