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Kerrie - the 8" F/5 will gather more light than a 7" MC. At F/5 your 8" gathers light about 10 times faster than the 7" MC, and has more light gathering aperture...
My thoughts, Get that EQ6 Pro and put your 8" newt onto it... The Mak Cass will be very hard to image with, due to its very long focal length, it wont cool down as quickly...
That said, for visual work, the 7" F/15 mak would have its advantages... perhaps a bit more contrast due to it having a smaller secondary obstruction, but in an overall test of the two, I think you'd almost always be more pleased with the views from the 8" F/5...
Cheers.
Alex.
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