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Don't know much about the Skywatcher dob (mine's a GSO) nor about the package you're considering.
As far as the focuser goes though, you will definitely benefit from getting the 10:1. Ease of use between the two just doesn't bear comparison.
As much as I hate to complicate things at this stage; have you considered getting either a cheshire tube or laser collimator? Collimation will rear its ugly head sooner or later, so you might as well be prepared.
Other than that, just keep asking questions. Someone here will have answers for you.
Cheers.
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