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I would add to that a Hutech or similar clear glass modified DSLR 40D with a CCnite X1 filter so you can still use autofocus and terrestial imaging but have the far greater sensitivity of the modified DSLR.
I have a 20D modified this way and it works fine for both.
I also have a 40D and it takes great photos and the 14 bit output is good.Live preview for focusing would also be a very good feature of the 40D.
I believe there is now a 50D and a 500D coming out. Not sure what the differences are except digic 4 processor, higher ISO settings (possibly useful but maybe not) and more megapixels (perhaps good perhaps not- more pixels with same sized chip means smaller pixels which could mean less sensitivity and more noise - check the reviews on this point).
Another thing to consider is most use Images Plus to control their DSLR and focus and image etc. Usually there is a lag before that program is updated to handle the latest Canon model.
Greg.
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