One other thing..........if the 16" is a little too big too handle.
I can recommend an 0111/UHC filter on a 12", it certainly brings out greater detail on all nebulas, than without!!
I've done a side by side comparison with a 16" without a filter and my 12" with a filter and the view is a lot better in the 12"!!
The 16" will shine above the 12" with Galaxies and of course the dimmer DSO's.
Don't forget that most of the commercial 16" Dobs are made by GSO (Taiwan).
The Flexitube Skywatcher & Solid tube dobs are the exception, they're manufactured by Saxon (mainland China)
Which ever size or brand that you choose, a great telescope is the end result.
Of course the wallet and what lies within is also a big consideration.
