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yeah you want live view for astrophotography. You don't need it but its nice. What it does is allows you to use the rear lcd as a view finder. This makes focusing easier as the standard they finder is pretty small. The 20d will be less noisy at higher iso speeds, and it is novicable. I can't tell you which is better for astro work, as i've never used them for it.
12 mp is also a nice boost over 8. More pixels is always good. Especially when you want to capture alot of finer detail..
My 2c.
Alex
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