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Argo Navis I would recommend first. You can always justify this as it can be transfered to a new scope and therefore not redundant. This means when you really have to change to bigger scope, your AN is still as good as gold!
If I am correct, the larger the mirror, the smaller the FOV is which may put you off. I would say after 10inches 18 would be the next recommended upgrade. The cost of an 18 is so high relatively that the decision is made for you with regard to that upgrade. This is all a bit back to front but it sort of makes sense.......
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