Thanks for the advice everyone.
The question I think I've reached is whether the 10 inch can deliver a significantly greater benefit than the 8 inch for observational astronomy. And therefore whether this benefit is worth the additional weight, additional bulk, additional cost and the additional attention needed for collimation.
I want to get a scope that won't dissapoint me with its limitations. As I see it, an 8 inch should do a decent job and therefore I'm favouring that. I need to be convinced that a 10 inch can deliver much greater observational experiences and is therefore worth the extra pain which comes with it.
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