My 2 cents...
While there has been a lot of good comments and opinions shared on this topic, in the end the choice is subjective and as I see it has a couple of levels to it.
The first hurdle (level) is you need to ask yourself why...Why do you think that you need/want some widefield eyepeices? What do you hope to gain or change from what you currently have? The related question is how do you want to use them?
The differences between the "high end" eyepieces might be difficult for some less experienced observers to apprecite (myself included)...To really benefit these differences require using them (often)...
If you have not had any experience with Nagler/Pentax eyepieces I encourage you to get some eyepiece time with them before you plonk down your money. For their price, you could easily justify a Jetstar/Virgin Blue ticket to check out a viewing night...At AUD$400 a pop you don't want to be wrong too many times!
The next level is after you have decided that you want "the best" and can see some of the differences then it comes to your own subjective opinions...eye relief, size/weight, field of view etc.
Depending on what you are after, I don't think you can go too far wrong with either Teleview or Pentax products...
For me and the way I use them...I like the Televiews above 11 mm and the Pentax below 11 mm. That is, when I am using less magnification I do appreciate the extra field of view that the Nagler line offers...However, when I am cranking up the power for detail, I prefer (slightly) the view through the Pentax. Had I never looked through a Pentax would I be thrilled with the Naglers? Yes...and the converse is true too...Each line of eyepeices has it's own strengths and weakness...
Use your own eyes to decide...you might decide that you would rather have the cash in your pocket...or like many, you may soon become a member of Eyepieces Anonomous...
Good Luck to you!
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