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Perhaps one thing to consider is the mount that you're intending to use / using currently if you're going for astrophotography. A 120ED might be borderline for some mounts. Something to bear in mind whilst you're acquiring gear anyway.
If you're going to use a guide scope as well, that'll add extra weight, and extra cost (remember that if you're guiding, you'll also need a guide camera for the guide scope). Lots to consider, and a really fun journey ahead for you. There are heaps of really knowledgeable people here who are sure to help you along the way as you flesh out the direction you're heading in.
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