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If your scope isn't on a tracking mount, it becomes more important to have eyepieces with a larger FOV to reduce the manual tracking effort while you're at the eyepiece. I would probably be considering eyepieces in the 68-82 degree FOV range - second hand from IIS if possible. Another thing you could consider might be a filter. For a 130mm reflector, an OIII might be overkill for the aperture (although it suits my 127mm refractor just fine) but you might get away with a UHC to bring out some extra details of nebulae under the light polluted Sydney skies. I've just purchased a Baader Neodymium filter to try but haven't had a chance to test drive it as yet. Anyway, there are filter options that might be worth exploring too.
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