Explore Scientific eyepieces offer a substantially wider field than Plossls and the 1.25" models will cost under $200 used. They have good enough correction to perform well in all scope types.
Some others under $200 (used) worth considering would be:
Pentax XF 8.5mm (not so much the 12mm)
Vixen LV, NLV & SLV
William Optics UWAN
Long Perng LER (long eye relief) - also sold under various brands like Orion for a lot more money - buy the cheap versions.
I've owned or used eyepieces from all of these ranges and consider them a step up from standard Plossls.
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