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Scott,
It seems like your heart is set on the Nikon. May I ask, why that is?
If you feel that you'll be using it primarily for terrestrial work, and the occasional outing on the back of a telescope, then, it won't really matter too much which way you go. However, just take a look in the deep space imaging section at anything that isn't taken with dedicated astrophotographic CCDs, and you'll soon see that it is all Canon. There's a reason for it -- it's tried and tested, the accessories and software are all available (in some cases for free), and, it's a relatively cheap (300D/350D) and easy way of getting into DSLR imaging.
Also, remember the median filtering crap that's applied to Nikon RAW files...
Regards,
Humayun
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