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8" dobs are normally f6 and 1200mm long. They tend to be a little more clumsy on an EQ mount due to their extra length.
If you are getting the HEQ5 for AP work, have you considered selling the dob, (very easy to do) and getting an f5 1000mm newt OTA and eventually a nice big-sensor CCD such as a QHY9?
I just make the comment as I went through the same experience and the f5 is just physically a better choice on the EQ mount. If you later decide you want longer FL for galaxy imaging, keep your eye out for a used GSO 8" RC. My 2c.
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