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Anthony you'll also potentially need to be careful regarding eyerelief, depending on whether you observe with your glasses or not (I can't remember if you take them off).
The Orthos john mentioned are great, but if you observe with glasses they may not be for you.
I think from one of Anthony's other posts, he was not so concerned about edge of field sharpness... and I know you won't want to spend > $200 on a single eyepiece.. So why not try the GSO Superviews? They come in 15mm and 20mm focal lengths (1.25"), so if you get a 2" 2x GSO barlow ($79), you'll effectively get 4 additional eyepieces (7.5, 10, 15, 20).
The GSO Superviews are reasonable quality in an f/5 for the price, if you can live with softness around the edge.
Rod has the 15mm and 20mm GSO SV's, so why not ask for a lend at the next observing session?
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