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If you check the 30D on eBay, they are also now starting to go for under the $800 mark for body only. The 30D, while being only 8.2 Megapixel, uses a battery with twice the capacity of that in the 400D. Most of their features are almost identical, with the 30D having some slight advantages in some areas (min. shutter speed, frame rate) which gives it an advantage for non-astro use.
You should also figure out your angular pixel size to see if the 8 or 10 megapixel camera is a better match to your OTA.
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