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If you have the readies and transporting is no problem then the 16" will blow the socks off a 12", simple as that. BUT it is massive, heavy,awkward to move around which are simply the price you pay for the extra aperture. It can be significantly improved by a better base which you could make if you are into DIY.
After saying that, the 12" is a stunner and MUCH easier to handle and you would be really happy with its performance.
As for an Argo, it is not necessary. I have yet to get one and am quite happy but it would be a great accessory but not top of the list.
Cheers
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