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Hi there astropolak.
Light pollution isn't too much of an issue, but I think that 7mm would be too powerful for an SCT, and may only be able to used on those rare nights of above average seeing.
The 9mm is probably a better option for you and would be able to be used on a wider range of targets more often.
However, a few questions as well:
1. What's the FL of your scope?
2. What eyepieces/barlows do you currently own?
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