I don't believe an EQ5 or an EQ5-goto will adequately support an 8" scope. As the upper limit of the EQ5 mount is ~8kg. Running the mount at it's upper limit will result in stars that love to jump around in the field of view.
The HEQ5 PRO (goto version) is rated ~17kg and will easily take an 8" scope. You are not running the mount to its upper weight capacity. If you can take the HEQ5 Pro option it's worth the investment as it won't limit you scope choices down the track, nor will it be as prone to wind shear vs the standard EQ5 option.
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