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a factor that a lot of people miss is the temperature factor, yes a CCD has advantages over a CMOS sensor (that's the primary difference between the two). the 40d is a great sensor and is a relatively big sensor, where it falls down is 2 places Temperature you need to have a low ambient temp to my mind > 10deg anything much over that and the noise is unbearable. Secondly is the modification, you have to modify and remove the daylight filter that all manufactures put on there to cut UV/IR transmissions, Hydrogen alpha which emits in the near IR spectrum is virtually all but blocked by these filters leaving your choice of photo limited. Currently i use a Canon 40d that has been modified, not by choice its just what i have.
If you have the means get a cooled astro ccd, a qhy8 OSC (one shot colour) is a bonza camera, well supported and produces results.!
As your wanting to get into astrophotography there's loads of things that you need to look at, keep asking questions and if you are buying kit ask the knowledgeable gents and ladies here, you'll save yourself alot of $$$
that said have a look at my website listed in my tag below. that will give you an idea of what a dslr is capable of in the right temperature zone
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