The 8-24 covers the medium to high power range perfectly well and theres not a lot of scope on a C6 for anything much longer than 25mm (which you have).
Suggest you attend a star party hosted by a society near you, see what people are using and try a few for yourself before committing $.
Alternatively you could take the plunge and buy 3-4 Televue Naglers and be done with it.
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