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Hi Chris,
Looking at the range of eyepieces you already have you seem to have covered most bases.
From the range of eyepieces in your poll it seems you are looking for a good short FL eyepiece. The best short FL eyepieces I have ever used on my 16" F4.5 and 12" LB are the Orthoscopic design. I have a 6mm and 4mm and fellow IIS'er Kevnool has a 7mm of the same design.
At high magnification the field of view is largely irrelevant, that is in my humble opinion. To my mind a good Orthoscopic eyepiece will give the most contrast and best views of the planets and other bright DSO's and will probably leave you with a substantial amount of change from your $400 budget.
Might I also mention that the quality of the image I get from my 9mm Nagler in a 2 x triplet Barlow is not as good as the images I get from my 6mm and 4mm Orthoscopic eyepieces and if you are wondering about the quality of my Barlow, check out my images on the Solar System Imaging Forum.
Regards
Trevor
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