Having just sold a fantastic CPC1100 and having looked through a few large DOBs, I can say that the above advice from Barx and northern are good.
and Poitas suggestion sounds interesting, although this is new to me and something I need to investigate.
The CPC1100 is a fantastic machine.
Great optics, good magnification FAST and EASY to set up and align
GOTO is precise (depending on accuracy of initial alignment, and balance of machine and accessories).
Mine never ever needed Collimation from originally set.
However, balance can only be achieved with an add on counter weight system (IMHO).
And if power goes you are pretty much stuck. (but you can disengage both drives and move manually but this is not too precise).
The Bigger DOB is not as easy to set up, probably requires more cooling of the big mirror, probably needs to be collimated every outing, and is more susceptible to WIND.
Also, not all GoTo systems are created equally, but push to is a definite advantage, which is available on some GOTO machines optionally.
However, the greater Light Gathering capacity makes it a definite winner in my experience. You will see DSOs that you can only see in the CPC by using "Averted Imagination".
And Northern is right, in that Neither is an acceptable option for semi serious astrophotography.
Good Luck with your decision, and feel free to ask more questions.
