Zachary,
In my opinion there is no comparison between the digital SLR's and all other styles and types of digital cameras with regards to shooting in low light. I've said it before - the D70 is a low light machine, and I have no reason to believe that other comperable digital SLR's are not similarly suited.
I would commend you to the following link which is a test regarding extremes of ISO settings on the D70:
http://forum.portraitartist.com/showthread.php?t=4472
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