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For a 12" scope with a 1500mm focal, the maximum practical magnification is 300x on a very, very good night but most decent nights, it is more at 150x.
So, you should not buy an eyepiece with a focal 5mm or less.
ES 6.7, 8.8 and the Pentax XF8.5 are good eps and these are less than $200.
Perhaps the TMB 6 or the WO Swan 9mm which are less than $100 at VTI Optics?
Best to take your time and get deeper into the hobby before spending money on exotic eyepieces.
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