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If your observing location is a badly light polluted backyard there's nothing to gain from a 2" diagonal and 2" eyepieces. The reason to go to 2" gear is to get low power wide fields of view for observing larger DSO's. If you have or can get to darker skies a 2" SCT diagonal and Explore Scientific 34mm eyepiece (for example) would give nice views of various nebulae and star clusters.
Stick with the screw-on type 2" diagonal to avoid the diagonal hitting the drive base.
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