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Hi Stu,
having owned at the same time 8", 12", and 14" Dobs and having all set up beside each other going through the sizes quickly sighted on the same objects (whether DSO or solar system) there is a definite improvement in views as aperture increases. And yes the 14" was clearly a step ahead of the 12" (particularly with DSOs).Eventually I quite the 12" but still have an 8" and 14".
In terms of light gathering a 12" collects 2.25x that of the 8".
a 14" collects 3.00x that of the 8".
The 14" gives the real WOW factor. If you can manage it go for 14".
Stephen.
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