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Out of your list the 8" is the easy winner for almost any general observing. As everyone else has said for DSO the bigger the better but something called the budget hits us all and if the 8" and collimating eyepiece falls within your budget then go for it. I still use my 8" most often as the larger scope is just that bit more work to set up and move but if its a great night then it comes out and I love it.
Remember, the best scope is the one you use the most and that doesn't send you broke so you observe out of guilt.
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