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Roobi, remember maximum ususable mag is 50x per inch of aperture, so for a 5" scope 250x is maximum in perfect conditions, most of the time, much over 100x is getting hard. I do most (80%) of my observing at 67x and the rest at 113x and find these adequate. Many DSO are actually fairly large so don't need magnification, but are very faint.
The Nagler zoom is an expensive bit of kit, $450 + I think. As with most Televue products I am sure it is well made, but I would definitely seek an opinion from someone who has one. I have not seen many people with zoom EPs, I gather the main reason is that fixed focal length EPs are optimised for that length, while zooms inevitably involve a level of compromise.
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