Hi Pete
Great times ahead for you
Problem on this forum is that you will get plenty of misinformation and biased opinions based on interpretations, prejudice, ignorance and plain ill will, for example... all ASA Newt astrograph mirror sets are actually made by Orion Optics UK and the Orion Optimised Wynn Corrector is a 4 element design
On the up side it will be a fun journey and I wish you well, if money was no option then the Cerevolo
would be very nice, even if only 12"...but 16" sounds attractive for much less cost huh? and don't forget aperture and speeeeeed - being able to reduce that exposure time makes for more productive imaging.....how about a 20" F3.8
Mike