Hi Paul,
I would heartily agree with the suggestion of a 8-10" dob and with Eric's advice to focus first on a mount that is suitable for observing rather than imaging. I would really very strongly recommend that you have a look through someone else's scope first to get an idea of what you are likely to see. You may already have done this - if so, please disregard the next bit. It seems to me that a lot of people get a bit of a shock when they observe visually as deep sky objects mostly don't look like they do in astro images as the human eye cannot perceive colour under low light conditions. They are referred to as "faint fuzzies for good reason. Having looked through the kind of scope that you're thinking of buying is a great way of having realistic expectations of what you'll see and you will enjoy astronomy a lot more. So I reckon it would be good to take up Martin's offer, or get along to a star night before you buy.
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