With your present eyepieces, while not the best on the market, I would agree with David that one 13mm Hyperion would be a real asset. The other two eyepieces are functional as they are.
I would then save for one to replace your 10mm, I would suggest a 9mm Burgess Planetary, good eyerelief and a 60 degree AFOV at about $120.
Add a good 2x barlow to that when finances allow and you are starting to cook with gas.
Make haste slowly and don't end up with a lot of paperweights.
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