That question is impossible to answer...everything regarding what eyepieces you must have is speculative...their is no right or wrong answer...it depends on what you want to see....just by having the eyepieces you have already is sufficent for all observing.....
Some may say a 9mm would be handy but thats it...once you start looking at widefield and see the price you may start to think the eyepieces you already have is all you will ever need.....hehehe
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