What kind of low light photos? With or without flash?
It's not so much the focus ability you will need to look at (although this is important). You'll need to look at how the model will perform at higher ISO speeds, which will be needed to prevent motion blur in low light conditions. Lens brightness will also be a big factor.
The vast majority of non-DSLR digital cameras are not very useable in these conditions (unless you'll be using a tripod, with non moving subjects, keeping ISO speeds set low; or using a flash.)
Otherwise, you'll havehave motion blur from camera shake/subject movement and/or high noise levels in your images from higher ISO speeds needed.
You may want to give more details on what type of photos you plan to take.