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HI Nesti
I think you would want to try a barlow first before buying one . They cause a lengthening of the eye releif which some people find hard to handle, and also can be ungainly. Also with low power eyepieces there can be some vignetting at the field stop. I don't think you would benefit much from a Paracor at F5 though you will see some small gains.
As far as high power goes you can't go past the Televue Radians as they have stunning contrast and a 20-mm eye releif. Some people swear by the Pentax eyepieces too. 5mm would be optimal for good seeing giving you a 1mm exit pupil.
The most glaring hole in your collection is the 14mm Plossl and 9mm Plossl. You would benefit from a better eyepiece like Nagler 13mm type 6 for deep Sky ( or even a 2" televue 17mm Nagler Type 4 ) . 9 mm Nagler would be good also or a 10 or 8mm Radian or Badder Hyperion.
Hope this helps.
Mark
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