In the current generation of cameras, I believe Nikon have the edge, however if you're looking for something around the age of the D70S or the Canon counterpart at the time, which was the Canon EOS 20D. The 20D is far superior for astrophotography.. Less noise, better software support etc... If you're looking for something a little cheaper, the Canon 350D is a good choice too... You should be able to get a 350D between 300 and 400 bucks.
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