Best DSLR + lens combo for low light, indoor kid shots

I have thought about the D5100. This review of its AF performance says it's a poor implementation of continuous autofocus mode + subject tracking AF and live view just isn't designed right.

Since I don't actually own the camera, and have never used anything but a compact, however, it is very hard for me to concretely imagine how the camera is actually used and whether these criticisms apply to how I would use the Nikon D5100.

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Ted
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