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for this type of short focal length refractor eyepieces are hard to come-by..if it was me i would be looking for something around 50-60x for scanning - then 100-150x for zooming in on objects
i can't remember your scope exactly but i gues it would be somewhere from f5.5-f7. eg 550-700mm f length. to get ep mag divided this length by the eyepiece number eg 700/ 20mm ep = 35x magnification. if it was me i would be looking around 12mm for wider views & then maybe 5mm for close in views. Your choices are limited as shorter focal length highlights the defects in cheap eyepieces.
Look for secondhand, maybe a pentax xf 12 mm or 8.5mm -in the 5mm cheapest decent eyepiece is probably somethign like baader hyperion 5mm
ep choice is very personal though - one man's trash is another treasure, i don't mind not having super-wide views
if you want to barlow can get longer length ep's eg the TV plossl 20mm for sale in the classified is a great starter ep, not too expensive, good views & always good re-sale..then again i personally don't like barlows so much for visual
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