I’d say that you’re pretty much on the money. The Sky watcher Esprit series is very good and will work well with your DSLR. It comes with its flattener so you don’t need to add that into your price.
Mounting a guide scope on it shouldn’t be hard at all. The easiest would be to get a cheap V saddle plate. This can be bolted on top of the 80mm rings where it would act as both a handle for carrying and a mounting plate for the guide scope.
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