Posted By Doug Walton
In this case, I would be careful not to just accept the simple axiom that "more aperture = better views". That axiom assumes a lot! The 16" may deliver more light for DSO viewing, but that doesn't automatically mean that planetary, lunar, and binaries will be better. Not all mirrors are equal in terms of accuracy or smoothness.
If Intermountain mirrors were as highly-regarded as Zambuto, then Intermountain would have the same reputation of excellence as Zambuto. But they don't.
Find someone who has actually compared, side by side, comparably-sized and mounted Intermountain and Zambuto mirrors, and listen to their opinions. Otherwise, rely on Zambuto's excellent reputation, which wouldn't exist if the difference wasn't obvious to so many people.
Maybe you should stick with the 10" Zambuto, and down the road, see if you can somehow aquire a 16" Zambuto. A 10" Zambuto, with a good secondary and scope structure, could be a wonderful scope. I do know that Zambuto mirrors have completely changed my expectations of what "quality mirrors" are all about, and this came after comparing them with other mirrors.
And if you decide to go the 16" route, sign me up as the first person interested in buying your 10" Z mirror.