Maru, Dob's aren't really designed for imaging so I wouldn't recommend them anyone who wants to image. However since you already own one then I suggest getting a colour planetary camera as they will be much easier to work with. If you're looking for more control over colour and detail then getting a mono with filters will better (most of the time I can't tell the difference). As for brand there are plenty of choices but QHY and ZWO seem to be the favourites. To reiterate what Sil has already suggested the ZWO ASI120 is quite popular. I've been playing around with one lately and although it's not considered the best, it sure is good enough.
Planetary imaging with the Dob may not be the easiest or the best way to go about it, but it can yield interesting results and will save you from having to buy another scope.
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