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I'm looking at the same, froggy.. mine will be at the 5 to 7mm focal length though.
I've narrowed it down to:
- UO HD Orthoscopics ($125 each) - small FOV, but sharp and good contrast.
- Vixen LV ($170ish each) - small FOV, sharp, more eye relief and a bigger eye lens.
- Tak LE ($200+) - I've been using Louie's 7.5mm Tak LE and I love it. Sharp almost all the way to the edge, plenty of eye relief, good FOV and very comfortable to use.
- Nagler 7mm ($300+) - well, you know. Is the wide field of view really necessary for planetary, when I'm using an EQ platform anyway?
There's also the 6mm radian ($200+ ?) which has plenty of eye relief, and of course the TV plossls which are about $150 which have a great reputation.
So there's plenty of options that won't break the budget.
For me though, i'm delaying my purchase until AFTER Lostock so I can test these eyepieces in my own scope. That way i'll make a much more informed decision.
I wouldn't spend less than $125 for your planetary eyepiece (ie: the Orthos). While you say you're happy with the Series 500, I think if you spent some quality time side by side comparing the two, the Ortho would kill it for detail, sharpness and colour.
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