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It depends what you're aiming to do. You mentioned planetary but as you're taking about eq mount and longer exposures, I'll assume you're aiming towards DSO imaging.
I'd say to go with an 80mm triplet APO and a reducer/flattener. You can get to f4.8 with that combo pretty easily (ie the ES80 and Orion 0.8ff/fr).
I have the 130mm version of the TS scope mentioned below and have always been impressed with it.
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