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A great buy Gordon! Congratulations!
Regarding your query, I would add a GSO 2" quartz diagonal as a first upgrade. I found with both my Celestron CPC and a friend's LX90 that the star images immediately improved from fuzzy to text-book with the new diagonal.
I would wait until you have used it for a while before deciding on a focal reducer.
All the best, and happy observing!
Dean
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