Advice requested, indoor, low light shooting, gaggle of little dancers.. :-)

Hi everybody;

I've been requested to shoot at an indoor event with lots of 8 year old dancers.

I shoot with a D7000 and depending on where I sit may use 35mm, 50mm, or 85mm.  I have the 70-300 but likely it's to slow for the venue.

My main questions are, highest ISO to use, and slowest shutter speed to use.

I realize these are VERY subjective questions.  Sharpness vs noise vs color vs personal taste, etc.

Still, I usually shoot outdoors in daylight and would appreciate any thoughts.

Craig