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Go for the biggest , beefiest and best GEM you can afford. (It will pay dividends and will serve you for a very long time.)
A guidescope or an OAG is a good investment too if you want to do long exposure guided images and any prime focus stuff.
A comma corrector is a must if you go to a newtonian. (Only choices here are Vixen, Baader and TeleVue. Lumicon are no longer made and scarce as hen's teeth - I just bought one and I believe it was last unowned one in the universe and it took a lot hunting to find it)
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