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Your lowest power could be a 2" eyepiece if the goal is to achieve a wider true field (low power 2" eyepieces have larger field sizes than 1.25"), but bear in mind that the eyepiece will be large, heavy, and expensive compared to 1.25".
And if the 2" eyepiece is not more expensive, it may be more poorly-corrected. Your scope has such a long f/ratio that it will not induce aberrations in eyepieces, but there are some eyepieces that are just inherently poorly-corrected, like the GSO Superviews.
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