My TEC180FL would have to be my favourite. Its a versatile instrument, large aperture for an APO yet still "portable". Views are very good and for imaging it'll do both widefield and the larger galaxies.
AP140 would be my 2nd choice. Unbelievably sharp views visually. Even though I'd had several excellent scopes, visually it took me by surprise at how pinpoint stars can look.
Greg.
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