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The 1100D is definitely preferable over the 1000D, 14bit vs 12bit, and has lower noise (Digic 4 vs Digic III processor)
The 450D is also 14bit but is Digic III, so reports that the 1100D has less noise could be right.
Often on sale body-only for $270 new, the 1100D is the best bang for buck out there.
Other advantages of the 1100D over the 450D:
Shoots video(if you want to try planetary imaging)
Longer battery life
Slightly greater dynamic range
Higher ISO options (6400 vs 1600)
Lighter
450D advantages, has slightly larger screen(tho the same resolution) and sensor cleaning.
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