Well, the 40D and 450D are the ducks guts for astro, but the 1000D has all the tricks they have for less money albiet with a few non-astro related differences ( 10 vs 12.2meg CMOS sensor, not important, 2.5" viewer vs 3.0", some missing fancy focus features), and its lighter, so id say it would be an excellent choice with its lower price.
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