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I read below where you only have GSO eyepieces so far - I find them decent enough, but not wide enough for when pushing around a dob at higher power.
If you are going to get into going to dark sites and hunting faint galaxies, nothing beats a 2mm exit pupil. Just multiply the exit pupil you want by the f ratio, in your case 2mm x5= 10mm eyepiece. If you get a coma corrector that adjusts the f ratio, you'd get a different eyepiece result.
And, that 2mm exit pupil eyepiece should be as good and as wide an angle as you can afford. A 9mm eyepiece such as you have and were thinking of getting, will give a slightly smaller exit pupil. That makes it a bit harder to find galaxies out in the country, but gives slightly more pleasing views in light polluted skies.
Apply a good quality 2X Barlow, or even better a Powermate, to that 2mm exit pupil eyepiece, and you have a nice high powered view.
Regards,
Renato
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