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My most used eyepieces were the two longest focal length (lowest magnification) ones. Agree with the above - in average seeing I use 30x as a maxium rule.
Lower magnification is kinder for seeing issues.
I'll add another rule - high quality apo's - from their design work better at maxium magnification than SCTs, the central obstruction gives you another factor to compensate.
The other consideration is only a handful of objects love magnification - the Moon, Jupiter, Mars, Saturn, Omega Centurai - a lot look great at lower magnifcation if you have sufficent light grasp.
Finally eye pieces have vastly different wow factor based on design and price. A plossl variant costing around $60 - $90 isn't going to remotely compare with a $250 - $300 Vixen LVW eye piece, which is behind a $500 - $600 Nagler which is far behind the Ethos maxing out at around $850 - $900. I'd prefer to have a smaller set of really satisfying eye pieces that a great swarm of un-impressive ones.
Look at the second hand sales - you can find some good bargins!
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