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Hi Stephen,
I salute your choice to take time to know your scope and to go for quality eyepieces. I do have a couple of thoughts. Firstly, assuming your scope is fl 1200, the nagler 16 will give you a TFOV of 1.1 degree and the panoptic 24 will give you 1.3. These may be a little close. I sold my 24mm pan when I got my 17mm nagler as they were just too close. Also you mkay not want much more than one degree for a wide field ep, so you might be able to do without the Pan, lovely eyepiece though it is. The other thought is that some people (myself included and I don't wear glasses for observing) find the eye relief on the 16 mm type 6 Nagler a little tight. Others don't mind. I also found it a bit harder to get the eye position right on the 16. I bought the 17mm type 4 Nagler instead and really like it. At Vicsouth last year I got to compare the 2 in my f4.9 scope and was very pleased that I got the 17mm and didn't like the 16 nearly as much. However when we compared them in Tim Nott's f3.6 22" scope, the 16 mm type 6 performed better - there was a bit more astigmatism in the 17 mm using the faster scope. So this might be an issue if you upgrade. But then, if you find the 17 mm doesn't cut it, you would have no problem selling it on IIS I suspect. For the loss of $75-$100 you might have some years of more pleasurable observing.
Sooo... I wonder if it might be worth going for the 17mm Nagler, the 10 mm Pentax and then seeing whether or not you need a wider field eyepiece. You might save about $300. Only thing is you have a 2" ep instead of all 1 1/2" but you just leave the adapter on the 10mm while observing and no problems.
Again, you may be quiet happy with the 16 mm type 6 as many people are, but i would suggest looking through one before you buy.
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