Hi John,
I think you'd be wasting your money to upgrade from GSO plossls to Meade s4000 plossls. Figure out what your most used magnification is and save your pennies until you can afford a top shelf eyepiece at that focal length. While you're saving you might run into a good deal on a used eyepiece. A 65 to 70 degree AFOV is really worth it.
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