Naglers have seven elements in them Plossels have 4-5 elements in them.
For Viewing nebula's and galaxies I recommend Panoptics by televue, I have one of these on order and they are made for this purpose.
There are many good quality eyepieces to choose from, some of which are the televue and pentax and by the look of it the Meade series 5000. Do some research and find the ones that you want, then see if you can do some viewing through one at an observing night.
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