Gday Nick
You will enjoy the 12" and it's photon guzzling abilities immensely.
Your choice will also pre-deal with aperture fever nicely so that scope should be a keeper for many many years.
One other quick thing to check is whether the scope will potentially handle a dslr attached for some imaging. This is a road you may want to go down in the future. Dobs are not great for imaging however it can be done.
Some brands do not have adequate focus travel to get the camera sensor at the correct point to image. From memory Orion scopes are no good, Skywatcher scopes are ok. I could be wrong here however if you do a forum search I recall IIS member Raymo has commented on this a zillion times. This is just another matter to potentially consider to more comprehensively future proof your investment.
Cheers
Rob B
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