Scott, see the post by Chriss in
this thread and also see
this page for more comparison which shows several quite important points.
Quote:
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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.
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Most of people use Canon because Canon used to be the clear winner in the low noise area and the choice was simple. However, we are talking about newer Nikon models and Nikon changed a lot recently. People should not use several years old articles comparing some old model (D70) - technology changes at amazing speed nowadays.
For example, Nikon D40 has been proven to be very good for astrophotography with noise levels comparable to Canon. The IR filter can be replaced as well. And speaking of cheap, you can pick up a brand new body for ~$350 on ebay.
I also read somewhere that D90 has excellent response for H-alpha with standard IR filter.