What sort of budget are you planning? Also what type of images - widefield? In which case FSQ106ED type of scope works best.
TOA130 would be top of the range as is TEC140.
APM have some APO ED doublets that are quite large and "inexpensive".
A TEC140 is a popular choice. Superb optics and size is just right for many applications both visual and imaging.
Greg.
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