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What you want will depend on what you want to image, plus what you are imaging with. As an intro, a shorter focal length setup is probably more appropriate and will give you a wider field of view. This is more appropriate for larger targets like nebulae, whereas a longer focal length is more appropriate for things like galaxies (and planets). The ED80 will be short focal length, while the CEGM DX 1100 is very long focal length.
Also you seem to have completely missed reflectors, which are large, cheap and good.
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