I had an SW680 wich is skywatchers version of the GS-680, I got rings with mine but also made a dob base for it. It now sits happily on top of an EQ6, but a CG-5 would handle it no worries, it's only an 8kg tube. Since you say you are looking for the EQ mount later on, maybe the Dob would be a better option, atleast to get you going to learn more about the sky etc....
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