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Following on from David's suggestions above ...
In the 40mm class, the Explore Scientific 68 deg. range is quite nice. Specifically, the ES 68d 40mm is around half the cost of a Panoptic, but still a very good view (though it's a big eyepiece), and there's a 34mm 68 deg. worth considering. Slightly cheaper is the TS Paragon (clone of the TMB Paragon) 40mm, which is nearly as good, but the ES 40mm has the edge on clarity/detail in side-by-side comparison. Both of these are better than the GSO Superview 42mm.
But, I can't help thinking that even the ES eyepieces are overkill for a 90mm Saxon refractor, especially since you have a few eyepieces to buy.
The GSO Superviews are easy to beat if you spend more money, but on a very limited budget, IMHO, they represent good value and might be a good step up from your bundled eyepieces.
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