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A 2" good quality barlow will be quite expensive.. The GSO 2" barlows are quite good on their own, and at a reduced price. Dave47Tuc recently bought the next price bracket up 2" barlow, there's a thread about it in the equipment forum. Take your pick, depending on your budget.
As others have said, you may or may not be able to put up with "seagulls" at the edge of the field of view. Your best bet is to look through some other scopes before making a decision.
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