If I were you, I would go for a 9mm Nagler T1, or a Meade 8.8mm 4000 UWA or even a Pentax 10mm XW and use a barlow on it. Obviously, the 10mm XW has much better eye relief and is more expensive, but you'll have the luxury of comfortable viewing.
I find that eyepieces with short eye relief make for a night in frustration, especially when your eyeball gets too close to that cold lens
, it immediately fogs up ;
, unless of course, you have an eyepiece warmer
!!!
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Mark
12" F/5 reflector
30mm 1 rpd
21mm TeleVue plossl
14mm Meade series 4000 UWA
10mm Pentax XW
2" GSO Barlow
Sony Dig 4.1 Mp Cam