I stayed with Celestron so I could use the Starsense unit. The C9.25 will go straight onto the CGEM; the only reason to change to a wider dovetail is to get a bit more stability, but you can try the existing skinny (vixen) dovetail first.
The CGEM was available new for about 1200 or 1300, so shop around and try to find a good price. It is fairly heavy, about 41 pounds for the head alone.
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