Reading this thread with interest .....
I've recently been running an all-sky camera using an old model ASI120mm and although these cameras are a bit noisy (15-20 sec exposure) I'm fairly happy with the results when using the software (AllSkEye) to subtract a dark frame I'm considering having 2 cameras. I often travel from my light polluted home to some nice dark skies and want to keep at least one of them as a 'portable' build and one 'fixed' at home.
These 2 images are with the 120mm with no dark frame subtracted, so things look a bit better now
Home skies
Dark skies - new lens
I've been looking at ZWO's offerings and have been considering both the ASI224 and ASI178 as possible options.
As the portable camera will be used under darker skies it seems to make sense to use one with the lowest amount of noise (no good going for low noise if the neighbours keep switching on security lights!).
I could just accept the noise level and go with another 120mm which would be cheaper, but my thinking (and justification should the wife ask!) is that I could use the better, lower noise camera on my telescopes when not needed for the portable all sky camera.
Al