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If you can find one secondhand, the Pentax 5.2mm XL is a great eyepiece. It has a 65-degree FOV and lots of eye relief (around 20mm from memory). Also, I think you would struggle to see much if any difference between this and a more specialist planetary eyepiece. And the extra comfort & eye relief will compensate for it. I bought mine via Astromart in the US for around US $200.
The later model (5mm XW) is even better and has a 70-degree FOV, but they are around $70-$80 more expensive.
The idea of getting a 10mm XW and barlowing it is also a good one. It just might be slightly cumbersome in your focuser, since the XW is a fairly long eyepiece to begin with. You'd find the XW 10 very useful for general observing without the barlow too. It is a classic.
Phil
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